mscorlib error visual studio 2015

Question

Severity Code Description Project File Line Suppression State

Warning Compiling transformation: Assuming assembly reference 'mscorlib, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' used by 'EnvDTE' matches identity 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' of 'mscorlib', you may need to supply runtime policy StokPro C:\Users\aras adar\Desktop\Stokkk\StokPro\StokPro\Models\DBModel.tt 1

How to solve this problem.thanks