Job disabled stage run manually, it was run with as below error...

Executed as user: servername\ExpSQLAgtSvc. 16 percent processed. [SQLSTATE 01000] (Message 3211) 33 percent processed. [SQLSTATE 01000] (Message 3211) 49 percent processed. [SQLSTATE 01000] (Message 3211) 66 percent processed. [SQLSTATE 01000] (Message 3211) 75 percent processed. [SQLSTATE 01000] (Message 3211) 83 percent processed. [SQLSTATE 01000] (Message 3211) 93 percent processed. [SQLSTATE 01000] (Message 3211) Processed 688 pages for database 'EMSEvents', file 'EMSEvents_dat' on file 1. [SQLSTATE 01000] (Message 4035) Processed 32 pages for database 'EMSEvents', file 'EMSEventsIndex_dat' on file 1. [SQLSTATE 01000] (Message 4035) Processed 16 pages for database 'EMSEvents', file 'EMSTimeAndLocalTimeIdx_dat' on file 1. [SQLSTATE 01000] (Message 4035) Processed 16 pages for database 'EMSEvents', file 'EMSLocalDateAndTimeIdx_dat' on file 1. [SQLSTATE 01000] (Message 4035) Processed 16 pages for database 'EMSEvents', file 'EMSLocalDateAndTimeAndLocalTimeIdx_dat' on file 1. [SQLSTATE 01000] (Message 4035) 100 percent processed. [SQLSTATE 01000] (Message 3211) Processed 2 pages for database 'EMSEvents', file 'EMSEvents_log' on file 1. [SQLSTATE 01000] (Message 4035) BACKUP DATABASE successfully processed 770 pages in 2.352 seconds (2.554 MB/sec). [SQLSTATE 01000] (Message 3014) 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 with PERMISSION_SET = EXTERNAL_ACCESS or UNSAFE. 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 emsevents, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An error relating to security occurred. (Exception from HRESULT: 0x8013150A) System.IO.FileLoadException: at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.Load(String assemblyString) [SQLSTATE 42000] (Error 10314). The step failed.