SharePoint debug - Unhandled exception was thrown by the sandboxed code ...

今天打算使用Microsoft Dynamics CRM list component for Microsoft SharePoint Server 2013，这是一个sandbox solution。于是下载之后上传到SharePoint的sandbox solution中，激活之后会添加一个webpart：“Microsoft
Dynamic CRM List Component”，当我把这个webpart添加到页面中的的时候，出现了下面的错误信息：

Web Part Error: Unhandled exception was thrown by the sandboxed code wrapper's Execute method in the partial trust app domain: An unexpected error has occurred. Correlation ID: 4e43c99c-34bf-2048-631f-a9d8d0bb5902.

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[SPUserCodeSolutionExecutionFailedException: Unhandled exception was thrown by the sandboxed code wrapper's Execute method in the partial trust app domain: An unexpected error has occurred.]

Server stack trace:
at Microsoft.SharePoint.UserCode.SPUserCodeApplicationHostAppDomainRef.Execute(Type userCodeWrapperType, SPUserCodeCachedAssemblyGroup userAssemblyGroup, Guid siteCollectionId, Byte[] binaryUserCodeToken, Byte[] proxyOperationToken, SPUserCodeExecutionContext executionContext, Boolean shouldUsageLog, Int32 currentProcessId)
at Microsoft.SharePoint.UserCode.SPUserCodeApplicationHostAppDomainRef.Execute(Type userCodeWrapperType, SPUserCodeCachedAssemblyGroup userAssemblyGroup, Guid siteCollectionId, Byte[] binaryUserCodeToken, Byte[] proxyOperationToken, SPUserCodeExecutionContext executionContext, Boolean shouldUsageLog, Int32 currentProcessId)
at Microsoft.SharePoint.UserCode.SPUserCodeAppDomain.Execute(Type userCodeWrapperType, SPUserCodeCachedAssemblyGroup userAssemblyGroup, Guid siteCollectionId, Byte[] binaryUserCodeToken, Byte[] proxyOperationToken, SPUserCodeExecutionContext executionContext, Boolean shouldUsageLog, Int32 currentProcessId)
at Microsoft.SharePoint.UserCode.SPUserCodeWorkerProcessProxyForShim.ExecuteInternal(Type userCodeWrapperType, SPUserCodeCachedAssemblyGroup userAssemblyGroup, Guid siteCollectionId, Byte[] binaryUserCodeToken, Byte[] proxyOperationToken, SPUserCodeExecutionContext executionContext)
at Microsoft.SharePoint.UserCode.SPUserCodeWorkerProcessProxy.Execute(Type userCodeWrapperType, SPUserCodeCachedAssemblyGroup userAssemblyGroup, Guid siteCollectionId, Byte[] binaryUserCodeToken, Byte[] proxyOperationToken, SPUserCodeExecutionContext executionContext)
at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)
... ...

可能的原因：

1. 到CA中检查sandbox服务“Microsoft SharePoint Foundation Sandboxed Code Service”是否停掉了
2. 到资源管理器中查看SPUC进程账户，至少应该有site collection管理员的权限：



3. 代码中使用了不被SandBox支持的类，例如SPControl等等。