Empty Response from Server

Hi, I was trying to sync when this message came up:

[JavaScript Error: "[Exception... "'Empty response from server' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "<unknown>" data: no]"]

Report ID: 805271439

Could you please let me know what I should do to fix this?

Thanks

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