How to solve the problem "Zotero is currently unavailable" with Chrome?

The state "Zotero is currently unavailable" has been existed for several months, and the suggested actions were also tried again and again according to "", while neither " " could open nor the suggested actions were worked.

My error report ID is 766209864 and the it was stated as follows.
[JavaScript Error: "HTTP request has timed out after 15000ms"]
[JavaScript Error: "No frame with id 87 in tab 177."]

Please, anybody could help me to fix this if he/she knows the way, and thank you very much.

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