The below Error was thrown while activating the feature in SharePoint Sandboxed solution in Sharepoint-2013.

unhandled exception was thrown by the sandboxed code wrapper's execute method in the partial trust domain

From ULS log:

Microsoft.SharePoint.UserCode.SPUserCodeSolutionProxiedException: That assembly does not allow partially trusted callers. Server stack trace: at ******.ListDefinition.Features.******.SiteColumn_Feature.******EventReceiver.FeatureActivated(SPFeatureReceiverProperties properties) at Microsoft.SharePoint.UserCode.SPUserCodeFeatureCallOutWrapper.ExecuteInternal(Object userCodeObject, SPUserCodeRemoteExecutionContext context) at Microsoft.SharePoint.UserCode.SPUserCodeRemoteExecutionWrapper.Execute(SPUserCodeExecutionContext executionContext)

Please suggest the steps to fix this issue.

  • This link suggests the issue could be fixed by deploying the solution as a Farm solution. Is that an option in your case?
    – moe
    Commented Jan 11, 2016 at 8:43
  • @moe Sorry that link was not relevant to my Query,I have Uploaded my Sandboxed WSP in Solution Galleries and on Activating the feature it shows the error
    – Sivam G
    Commented Jan 11, 2016 at 11:25

1 Answer 1


Please ensure that your assembly has a strong name.

Also, you can try to add [assembly:AllowPartiallyTrustedCallers] attribute to the assembly.

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