Getting Server error in my application

Jul 10 2017 1:20 AM

Could not load file or assembly 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

if i run application getting this server error in my application

please provide soultion regarding this..

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