I have fork class ServiceBusTriggerAttribute to public and removed sealed - getting exception

I have taken a sdk code from github and make fork class ServiceBusTriggerAttribute.cs public removed sealed.

namespace Microsoft.Azure.WebJobs
{
// Summary:
// Represents an attribute that binds a parameter to a Service Bus Queue message,
// causing the method to run when a message is enqueued.
//
// Remarks:
// The method parameter type can be one of the following: BrokeredMessage System.String
// byte[] A user-defined type (serialized as JSON)
[AttributeUsage(AttributeTargets.Parameter)]
[DebuggerDisplay("{DebuggerDisplay,nq}")]
public class ServiceBusTriggerAttribute : Attribute

and created 3 nugets from .nuspec files

WebJobs.Core.nuspec
WebJobs.nuspec
WebJobs.ServiceBus.nuspec

after installing these newly created packages when run my webjob I get following error :

An unhandled exception of type 'System.IO.FileLoadException' occurred in mscorlib.dll

Additional information: Could not load file or assembly 'Microsoft.Azure.WebJobs.Host, Version=1.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. Strong name validation failed. (Exception from HRESULT: 0x8013141A)

This question was already asked and discussed in a duplicate post here: getting exception after webjob sdk code fork for public class ServiceBusTriggerAttribute