Outdated google-api-php-client

Hello @aelsharawi

The fix will be included in the next release.
Fixed on issue https://github.com/wpCloud/wp-stateless/issues/446.

Thanks @aelsharawi,

We are aware of this error. The fix will be included in our next release.

You can try now from here.
https://github.com/wpCloud/wp-stateless/releases/tag/2.4.0-RC.4