Server Error in '/' Application. Runtime Error when loading picture

When I try to upload a jpg file to my game I get an error message. The following is the full dialog of the error message.

What do your think is the problem and how to I correct the issue?

Server Error in '/' Application.
Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable on remote machines, please create a

Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's

I tried again after resizing the picture to a smaller file size by changing the resolution to 72dpi. File size dropped from 1.2Mb to 328Kb.

The reduced size file loaded perfectly. I must have missed the file size limitation in the doc.

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