WordPress MultiSite Won’t Work on Google AppEngine

Google App Engine is a third party host and dealing with them is really off topic here. That error is a simple permission and/or file error and has nothing to do with WordPress itself.

You’re beter off asking at Google http://googlecloudplatform.github.io/appengine-php-wordpress-starter-project/ or trying https://wordpress.org/plugins/google-app-engine/

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