Web Part Error in Sandbox solution

Question

Hi, I used the following code for "ADD POST IN NEWSFEED USING C#" in sandbox solution 2013.
                    string serverUrl = "http://sanchit:5097/";
                    string accountName = @"tafecorp\spservices";          
                   SocialDataItem userMentionLink = new SocialDataItem
                        ItemType = SocialDataItemType.User,
                        AccountName = accountName
                    SocialPostCreationData postCreationData = new SocialPostCreationData();
                    postCreationData.ContentText = "{0} does great work!";
                    postCreationData.ContentItems = new SocialDataItem[1] { userMentionLink, };
                    try
                        ClientContext clientContext = new ClientContext(serverUrl);
                        SocialFeedManager feedManager = new SocialFeedManager(clientContext);
                        feedManager.CreatePost(null, postCreationData);
                        clientContext.ExecuteQuery();
                        lblReport.Text = "The post was published";
                    catch (Exception ex)
                        lblReport.Text = ex.ToString();
When i run the code the following error comes.  How to solve this issue. Thanks in advance.
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: 5f639c9c-7639-50f3-7dce-34ae387d3ed0. 

Answer 1

Share the details about correlation ID in ULS logs
http://sharepoint.stackexchange.com/questions/59679/sandbox-unhandled-exception-was-thrown-partial-trust-app-domain
Well it's taken a few days but I've finally managed to work this one out however it did involve me having to dissect the whole project and reintroduce each piece one at a time.
A few issues were causing it:-
1) I had set one of the projects "Include Assembly in Package" property to false.
2) A static method was making a call to an SPList which turned an empty (null) value. Added a value to that item and the error disappeared.
3) I'd declared a variable as being of type double and set its default value as 0.
Now why the system couldn't have told me that's what the problems were rather than throwing this generic error is a different story! It would have saved me many an hour of confusion.
http://stackoverflow.com/questions/3905388/sharepoint-2010-sandboxed-webpart-error
http://social.technet.microsoft.com/Forums/sharepoint/en-US/c11ab5df-562e-43b4-b350-5c4d07da8bf3/sandbox-solution-error-unhandled-exception-was-thrown-by-the-sandboxed-code-wrappers-execute?forum=sharepointgeneralprevious
http://sohilmakwana.wordpress.com/2013/11/29/sandbox-error-unhandled-exception-was-thrown-by-the-sandboxed-code-wrappers-execute-method-in-the-partial-trust-app-domain/
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