uncaught exception: [Exception... "'Sys.WebForms.PageRequestManagerServerErrorException: Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server. The status code returned from the server was: 500' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001c (NS_ERROR_XPC_JS_THREW_JS_OBJECT)" location: "JS frame :: resource://firebug_rjs/net/spy.js :: callPageHandler :: line 796" data: no]
I suggest that you temporary disable Ajax and take a look at the actual error, which will pop up.
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