Status: Open
Status: Answered
Status: Closed
Status: Duplicate

V9 designer not opening after an error.

Posted Apr 01 by Mike Gibson.

I have a 7.6 form that was converted through the migration tool to v9 and when I went into to the properties of a label I got the dreaded red X in the properties pane and the error message that goes with it. No big deal I'll just quit and re-open, I have seen this before. However, this time the designer will not open back up. I checked the error logs and received this message: System.InvalidCastException' occurred and was caught. I logged off and logged back into the server, same thing. I rebooted, same thing. I cleared my temporary files, same thing. Other users on the same server are not having this issue. Can anyone help?


3 Answers

BEST ANSWER: As chosen by the author.

Do you mean others can open the same file and do not get the same problem? If so, sounds like a cache error to me. The Designer seems to suffer from these a lot.


We typically find and delete temporary files. We are trying to document these in a thread here, as they are not documented anywhere, and seem to get put all over the place in a fairly random fashion:

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BEST ANSWER: As chosen by the author.

I have been working on other solutions without issue while he has been trying to address his situation … we are both working on the same server since we are in an early conversion environment.


I just opened his solution, was able to open the form he had his X item on, clicked on a few items on the form itself, and was able to save his solution and "save as" into a different location.


So it must be something with his set-up even though we are both on the same server.

BEST ANSWER: As chosen by the author.

Thanks for the help it was the isloatedStorage fodler that needed cleared. FYI, under for x86 the directory is located at:


c:\documents and settings\<username>\Local Settings\Application Data\




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