Hello Paul, I've tested the sample application provided at the link above and despite throwing a warning for deprecated Python 2.5 runtime, it deploys successfully. So the issue you're facing is indeed with project permission.
At first make sure the user account you're deploying with has either 'Owner' or 'Editor' permission for the project by visiting the permissions page <https://console.developers.google.com/project/_/permissions/projectpermissions>. If you need to add a user account, make sure to accept the invitation by logging into the invited account. You can then open App Engine Launcher and select 'Control' -> 'Clear Deployment Credential' to delete any saved credentials. The next deployment attempt should prompt you for granting access to the launcher. Before you hit 'Allow', make sure you're logged in with the correct user account (top right corner). I hope that helps. Cheers! -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/bb91cbf5-8247-4e58-b035-b46a418687e2%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.