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"Failed to connection to server"

#1 by hdsfghjgf

I just run into an issue in my computer's devserver and Heroku app. 
Last night, i just add JavaScript codes to my app and after that my app just started to have the error "Failed to connect to server" in both my pc and Heroku. In "Data" tab, i cannot see any of the data anymore, and this project has urgency.

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