The remote server returned an error: (500) Internal Server Error.
Make sure none of the column headers in your excel sheet has spaces or special characters. Also, I assume the Validation is successful, correct?
I am getting this internal server error on a client’s machine as well. We can navigate to the service url in a browser and validation is successful on the Service Settings window. However, after selecting the map and other Configuration choices, the Validate button in the ribbon does nothing at all – no message given. It is when selecting Run Map that we receive the error.
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