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Is it a one-time error or has it occurred numerous times?

It occurred numerous times.

Please go over the Google setup instructions explained in the plugin Help Tab again and save the credentials again in the plugin.

I have done that several times still experiencing the same error.

Pls check out the link below:

https://postimg.cc/Ff3pXTnZ

Is that the correct Json key or did i paste an incorrect key?

Send me an email via https://w3guy.com/contact/ with a video going over the process you followed to create the JSON credentials.

Hello

I have the Same Problem.

This typically happen if your Google json key is not valid.

Login to google cloud console and redownload the json key then save again in the plugin.