Invalid output from server [SOLVED]

It works now.

I've goy this message:

no]"]

[JavaScript Error: "[Exception... "'Invalid output from server (Report ID: 3f1a057ce3)' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "<unknown>" data: no]"]

With this ID: 1247658265

What should I do?
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