Job execution error after upgrading from SQL Server 2016 to SQL Server 2019

We have our database in SQL Server 2016 and we restored the same database, packages and jobs in new SQL Server 2019 server instance. We changed the environment variables to point to new server and also pointed new package path in the jobs.

While running the job we are getting below error.

Executed as user: (Sa Account). Microsoft (R) SQL Server Execute Package Utility Version 15.0.2000.5 for 64-bit Copyright (C) 2019 Microsoft. All rights reserved. Started: 1:45:30 AM Failed to execute IS server package because of error 0x80131904. Server: (server name), Package path: (package path), Environment reference Id: 10202. Description: An error occurred in the Microsoft .NET Framework while trying to load assembly id 65537. The server may be running out of resources, or the assembly may not be trusted. Run the query again, or check documentation to see how to solve the assembly trust issues. For more information about this error: System.IO.FileLoadException: Could not load file or assembly 'microsoft.sqlserver.integrationservices.server, Version=14.0.0.0, Culture=neutral, PublicKeyToken=(aaaaaaaaaaa)' or one of its dependencies. An error relating to security occurred. (Exception from HRESULT: 0x8013150A) System.IO.FileLoadException: at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean forIntrospection) at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.Load(String assemblyString) Source: .Net SqlClient Data Provider Started: 1:45:30 AM Finished: 1:45:30 AM Elapsed: 0.203 seconds. The package execution failed. The step failed.

I'm thinking it is some security (trustworthy setting) issue and version issue. If it is either or both of them, could you guys please help me our how to resolve this issue. Thanks.