Rajeev Pentyala – Technical Blog on Power Platform, Azure and AI

Recently while compiling my ADX web site, I was getting below compilation exception from all my .ascx (Views) files.

Compiler Error Message: CS0012: The type ‘System.Object’ is defined in an assembly that is not referenced. You must add a reference to assembly ‘System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’

Issue was bit strange as I already had “System.Runtime’ dll referred in the website

Fix:

• Open the Web.config file and add below tag inside the <compilation> tag

<assemblies>

<add assembly=”System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a” />

</assemblies>

• Your <compilation> tag should look as below

<compilation debug=”true” targetFramework=”4.5″>

<assemblies>

<add assembly=”System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a” />

</assemblies>

</compilation>

Note:

• If your <compilation> tag already had <add assembly=”…”> tags, add only <add assembly=”System.Runtime…> tag to the existing tags.

🙂