Nuget package didnot load correctly (VS 2015)

If i open my visual Studios, I am getting a message which says "Unable to load nuget package" refer to activity.xml

here is the log from xml:

CreateInstance failed for package [NuGetPackage]Source: 'mscorlib' Description: Could not load file or assembly 'NuGet.Tools, Version=3.4.4.1321, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. System.IO.FileNotFoundException: Could not load file or assembly 'NuGet.Tools, Version=3.4.4.1321, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. File name: 'NuGet.Tools, Version=3.4.4.1321, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' 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.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.Activator.CreateInstance(String assemblyString, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo, StackCrawlMark& stackMark) at System.Activator.CreateInstance(String assemblyName, String typeName) at System.AppDomain.CreateInstance(String assemblyName, String typeName) WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog]. {5FCC8577-4FEB-4D04-AD72-D6C629B083CC}

Please tell me how to proceed

I just had exactly the same error after moving to VS 2015. I found a link that recommended:

Uninstall NuGet Package Manager Tools => Extensions and Updates =>Installled => Tools

Click Uninstall on the Nuget Package Manager option to remove NuGet.

Restart Visual Studio

Reinstall NuGet Package Manager by Extensions and Updates

https://forums.asp.net/t/2102490.aspx?Nuget+package+didnot+load+correctly+VS+2015+

This worked for me and I no longer get an error.