Error 0x80131904 failed to load assembly id 65536 / HRESULT: 0x8013150A for microsoft.sqlserver.integrationservices.server I am running SSIS Packages through an Agent job and getting error 0x80131904:

Message:


  Executed as user: NT Service\SQLSERVERAGENT.
  Microsoft (R) SQL Server Execute Package Utility
     Version 14.0.3023.8 for 64-bit
     Copyright (C) 2017 Microsoft. All rights reserved.  
  
  Started:  1:00:00 PM
  Failed to execute IS server package because of error 0x80131904. Description:
  An error occurred in the Microsoft .NET Framework while trying to load assembly id 65536. 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=12.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. An error relating to security occurred. (Exception from HRESULT: 0x8013150A)   
  
  System.IO.FileLoadException:
  &nbsp; &nbsp; &nbsp; at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark&amp; stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
  &nbsp; &nbsp; &nbsp; at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark&amp; stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
  &nbsp; &nbsp; &nbsp; at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark&amp; stackMark, IntPtr pPrivHostBinder, Boolean forIntrospection)
  &nbsp; &nbsp; &nbsp; at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark&amp; stackMark, Boolean forIntrospection)
  &nbsp; &nbsp; &nbsp; at System.Reflection.Assembly.Load(String assemblyString)  
  
  Source: .Net SqlClient Data Provider
  Started:  1:00:00 PM
  Finished: 1:00:00 PM
  Elapsed:  0.328 seconds.  
  
  The package execution failed.
  The step failed.  


I researched and found that I should enable CLR and set TRUSTWORTHY to ON for the DB. I did that and in addition checked the database owner account; it's enabled and not orphaned. Still getting the error. I would highly appreciate any help on this.
Have you tried this: 

USE &lt;DATABASE&gt;;
EXEC sp_configure 'clr enabled' ,1
GO

RECONFIGURE
GO
EXEC sp_configure 'clr enabled'   -- make sure it took
GO


First Enable Trustworthy database property

ALTER DATABASE [DatabaseName] SET TRUSTWORTHY ON;
GO


And change the database owner to ‘sa’

USE [DatabaseName]
GO

EXEC sp_changedbowner 'sa'
GO