How to debug "Cannot insert explicit value for identity column in table X when IDENTITY_INSERT is set to OFF"?

I have a problem with my web application. I just created my first web application."Probably" after updating my database I got an error message "HTTP Error 502.5 - Process Failure". I checked solutions on other sides and I didn't find a working solution.

BigProject.csproj:

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
  <TargetFramework>netcoreapp2.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <None Include="wwwroot\index.html" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.App" />
    <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.1.2" PrivateAssets="All" />
    <PackageReference Include="OdeToCode.UseNodeModules" Version="1.0.6" />
  </ItemGroup>

  <ItemGroup>
    <Folder Include="Services\" />
    <Folder Include="Views\Shared\" />
  </ItemGroup>

  <ProjectExtensions><VisualStudio><UserProperties package_1json__JSONSchema="" /></VisualStudio></ProjectExtensions>

</Project>

package.json:

{
  "version": "^1.0.0",
  "name": "asp.net",
  "private": true,
  "dependencies": {
    "bootstrap": "^4.1.1",
    "jquery": "^3.3.1",
    "jquery-validation": "^1.17.0",
    "jquery-validation-unobtrusive": "^3.2.10"
  },
  "devDependencies": {}
}

launchSettings.json

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:8888/",
      "sslPort": 44370
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "BigProject": {
      "commandName": "Project",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      },
      "applicationUrl": "https://localhost:5001;http://localhost:5000"
    }
  }
}

project.assets.json

version": 3,
  "targets": {
    ".NETCoreApp,Version=v2.1": {
      "Microsoft.AspNet.WebApi.Client/5.2.6": {
        "type": "package",
        "dependencies": {
          "Newtonsoft.Json": "10.0.1",
          "Newtonsoft.Json.Bson": "1.0.1"
        },
        "compile": {
          "lib/netstandard2.0/System.Net.Http.Formatting.dll": {}
        },
        "runtime": {
          "lib/netstandard2.0/System.Net.Http.Formatting.dll": {}
        }
      },
      "Microsoft.AspNetCore/2.1.1": {
        "type": "package",
        "dependencies": {
          "Microsoft.AspNetCore.Diagnostics": "2.1.1",
          "Microsoft.AspNetCore.HostFiltering": "2.1.1",
          "Microsoft.AspNetCore.Hosting": "2.1.1",
          "Microsoft.AspNetCore.Routing": "2.1.1",
          "Microsoft.AspNetCore.Server.IISIntegration": "2.1.1",
          "Microsoft.AspNetCore.Server.Kestrel": "2.1.1",
          "Microsoft.AspNetCore.Server.Kestrel.Https": "2.1.1",
          "Microsoft.Extensions.Configuration.CommandLine": "2.1.1",
          "Microsoft.Extensions.Configuration.EnvironmentVariables": "2.1.1",
          "Microsoft.Extensions.Configuration.FileExtensions": "2.1.1",
          "Microsoft.Extensions.Configuration.Json": "2.1.1",
          "Microsoft.Extensions.Configuration.UserSecrets": "2.1.1",
          "Microsoft.Extensions.Logging": "2.1.1",
          "Microsoft.Extensions.Logging.Configuration": "2.1.1",
          "Microsoft.Extensions.Logging.Console": "2.1.1",
          "Microsoft.Extensions.Logging.Debug": "2.1.1"
        },
        "compile": {
          "lib/netstandard2.0/Microsoft.AspNetCore.dll": {}
        },
        "runtime": {
          "lib/netstandard2.0/Microsoft.AspNetCore.dll": {}
        }

Error from event viewer:

Application 'MACHINE/WEBROOT/APPHOST/BIGPROJECT' with physical root 'C:\Users\prywatny\Desktop\Projekt Visual Studio\BigProject\BigProject\' failed to start process with commandline 'c:\program files (x86)\microsoft visual studio\2017\community\common7\ide\extensions\microsoft\web tools\projectsystem\VSIISExeLauncher.exe -argFile "C:\Users\prywatny\AppData\Local\Temp\tmp98B6.tmp"', ErrorCode = '0x80004005' : 0.

Edited

Stack trace:

C:\Users\prywatny\Desktop\ProjektNowy\BigProject\BigProject>dotnet run
Używanie ustawień uruchamiania z profilu C:\Users\prywatny\Desktop\ProjektNowy\BigProject\BigProject\Properties\launchSettings.json...
info: Microsoft.EntityFrameworkCore.Infrastructure[10403]
      Entity Framework Core 2.1.8-servicing-32085 initialized 'Context' using provider 'Microsoft.EntityFrameworkCore.SqlServer' with options: None
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (890ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      IF EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE') SELECT 1 ELSE SELECT 0
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (40ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      SELECT CASE
          WHEN EXISTS (
              SELECT 1
              FROM [Products] AS [p])
          THEN CAST(1 AS BIT) ELSE CAST(0 AS BIT)
      END
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (24ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
      SELECT TOP(1) [o].[Id], [o].[OrderDate], [o].[OrderNumber]
      FROM [Orders] AS [o]
      WHERE [o].[Id] = 1
info: Microsoft.EntityFrameworkCore.Database.Command[20101]
      Executed DbCommand (120ms) [Parameters=[@p0='?' (Size = 4000), @p1='?' (Size = 4000), @p2='?' (Size = 4000), @p3='?' (Size = 4000), @p4='?' (DbType = DateTime2), @p5='?' (DbType = DateTime2), @p6='?' (Size = 4000), @p7='?' (Size = 4000), @p8='?' (DbType = Decimal), @p9='?' (Size = 4000), @p10='?' (Size = 4000), @p11='?' (DbType = Int32), @p12='?' (Size = 4000), @p13='?' (Size = 4000), @p14='?' (Size = 4000), @p15='?' (Size = 4000), @p16='?' (DbType = DateTime2), @p17='?' (DbType = DateTime2), @p18='?' (Size = 4000), @p19='?' (Size = 4000), @p20='?' (DbType = Decimal), @p21='?' (Size = 4000), @p22='?' (Size = 4000), @p23='?' (DbType = Int32), @p24='?' (Size = 4000), @p25='?' (Size = 4000), @p26='?' (Size = 4000), @p27='?' (Size = 4000), @p28='?' (DbType = DateTime2), @p29='?' (DbType = DateTime2), @p30='?' (Size = 4000), @p31='?' (Size = 4000), @p32='?' (DbType = Decimal), @p33='?' (Size = 4000), @p34='?' (Size = 4000), @p35='?' (DbType = Int32), @p36='?' (Size = 4000), @p37='?' (Size = 4000), @p38='?' (Size = 4000), @p39='?' (Size = 4000), @p40='?' (DbType = DateTime2), @p41='?' (DbType = DateTime2), @p42='?' (Size = 4000), @p43='?' (Size = 4000), @p44='?' (DbType = Decimal), @p45='?' (Size = 4000), @p46='?' (Size = 4000), @p47='?' (DbType = Int32), @p48='?' (Size = 4000), @p49='?' (Size = 4000), @p50='?' (Size = 4000), @p51='?' (Size = 4000), @p52='?' (DbType = DateTime2), @p53='?' (DbType = DateTime2), @p54='?' (Size = 4000), @p55='?' (Size = 4000), @p56='?' (DbType = Decimal), @p57='?' (Size = 4000), @p58='?' (Size = 4000), @p59='?' (DbType = Int32), @p60='?' (Size = 4000), @p61='?' (Size = 4000), @p62='?' (Size = 4000), @p63='?' (Size = 4000), @p64='?' (DbType = DateTime2), @p65='?' (DbType = DateTime2), @p66='?' (Size = 4000), @p67='?' (Size = 4000), @p68='?' (DbType = Decimal), @p69='?' (Size = 4000), @p70='?' (Size = 4000)], CommandType='Text', CommandTimeout='30']
      SET NOCOUNT ON;
      INSERT INTO [Products] ([ArtDating], [ArtDescription], [ArtId], [Artist], [ArtistBirthDate], [ArtistDeathDate], [ArtistNationality], [Category], [Price], [Size], [Title])
      VALUES (@p0, @p1, @p2, @p3, @p4, @p5, @p6, @p7, @p8, @p9, @p10);
      SELECT [Id]
      FROM [Products]
      WHERE @@ROWCOUNT = 1 AND [Id] = scope_identity();

      INSERT INTO [Products] ([Id], [ArtDating], [ArtDescription], [ArtId], [Artist], [ArtistBirthDate], [ArtistDeathDate], [ArtistNationality], [Category], [Price], [Size], [Title])
      VALUES (@p11, @p12, @p13, @p14, @p15, @p16, @p17, @p18, @p19, @p20, @p21, @p22),
      (@p23, @p24, @p25, @p26, @p27, @p28, @p29, @p30, @p31, @p32, @p33, @p34),
      (@p35, @p36, @p37, @p38, @p39, @p40, @p41, @p42, @p43, @p44, @p45, @p46),
      (@p47, @p48, @p49, @p50, @p51, @p52, @p53, @p54, @p55, @p56, @p57, @p58),
      (@p59, @p60, @p61, @p62, @p63, @p64, @p65, @p66, @p67, @p68, @p69, @p70);
fail: Microsoft.EntityFrameworkCore.Update[10000]
      An exception occurred in the database while saving changes for context type 'BigProject.Data.Context'.
      Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.SqlClient.SqlException: Cannot insert explicit value for identity column in table 'Products' when IDENTITY_INSERT is set to OFF.
         at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
         at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
         at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
         at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
         at System.Data.SqlClient.SqlDataReader.TryHasMoreRows(Boolean& moreRows)
         at System.Data.SqlClient.SqlDataReader.TryHasMoreResults(Boolean& moreResults)
         at System.Data.SqlClient.SqlDataReader.TryNextResult(Boolean& more)
         at System.Data.SqlClient.SqlDataReader.NextResult()
         at Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.Consume(RelationalDataReader reader)
         --- End of inner exception stack trace ---
         at Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.Consume(RelationalDataReader reader)
         at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection)
         at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(DbContext _, ValueTuple`2 parameters)
         at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
         at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(IEnumerable`1 commandBatches, IRelationalConnection connection)
         at Microsoft.EntityFrameworkCore.Storage.RelationalDatabase.SaveChanges(IReadOnlyList`1 entries)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(IReadOnlyList`1 entriesToSave)
         at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(Boolean acceptAllChangesOnSuccess)
         at Microsoft.EntityFrameworkCore.DbContext.SaveChanges(Boolean acceptAllChangesOnSuccess)
Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.SqlClient.SqlException: Cannot insert explicit value for identity column in table 'Products' when IDENTITY_INSERT is set to OFF.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryHasMoreRows(Boolean& moreRows)
   at System.Data.SqlClient.SqlDataReader.TryHasMoreResults(Boolean& moreResults)
   at System.Data.SqlClient.SqlDataReader.TryNextResult(Boolean& more)
   at System.Data.SqlClient.SqlDataReader.NextResult()
   at Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.Consume(RelationalDataReader reader)
   --- End of inner exception stack trace ---
   at Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.Consume(RelationalDataReader reader)
   at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(DbContext _, ValueTuple`2 parameters)
   at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(IEnumerable`1 commandBatches, IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Storage.RelationalDatabase.SaveChanges(IReadOnlyList`1 entries)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(IReadOnlyList`1 entriesToSave)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(Boolean acceptAllChangesOnSuccess)
   at Microsoft.EntityFrameworkCore.DbContext.SaveChanges(Boolean acceptAllChangesOnSuccess)

Unhandled Exception: Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.SqlClient.SqlException: Cannot insert explicit value for identity column in table 'Products' when IDENTITY_INSERT is set to OFF.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryHasMoreRows(Boolean& moreRows)
   at System.Data.SqlClient.SqlDataReader.TryHasMoreResults(Boolean& moreResults)
   at System.Data.SqlClient.SqlDataReader.TryNextResult(Boolean& more)
   at System.Data.SqlClient.SqlDataReader.NextResult()
   at Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.Consume(RelationalDataReader reader)
   --- End of inner exception stack trace ---
   at Microsoft.EntityFrameworkCore.Update.AffectedCountModificationCommandBatch.Consume(RelationalDataReader reader)
   at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(DbContext _, ValueTuple`2 parameters)
   at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(IEnumerable`1 commandBatches, IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Storage.RelationalDatabase.SaveChanges(IReadOnlyList`1 entries)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(IReadOnlyList`1 entriesToSave)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(Boolean acceptAllChangesOnSuccess)
   at Microsoft.EntityFrameworkCore.DbContext.SaveChanges(Boolean acceptAllChangesOnSuccess)
   at Microsoft.EntityFrameworkCore.DbContext.SaveChanges()
   at BigProject.Data.Seeder.Seed() in C:\Users\prywatny\Desktop\ProjektNowy\BigProject\BigProject\Data\Seeder.cs:line 47
   at BigProject.Program.SeedDb(IWebHost host) in C:\Users\prywatny\Desktop\ProjektNowy\BigProject\BigProject\Program.cs:line 32
   at BigProject.Program.Main(String[] args) in C:\Users\prywatny\Desktop\ProjektNowy\BigProject\BigProject\Program.cs:line 22