[419 Sorry, your session has expired. Please refresh and try again] found when deploy app to product server but in local server not have error
And 2nd Question How to clear cache in Google App Engine My problem is I not found where app folder
Error 419 is usually the issue of CSRF. If it’s working on local server but not on production, make sure sessions are being set correctly.
Also, sometimes the issue is that your permission is not set correctly, therefore no “write “ permission. Try and change permission to 777 on production, storage folder. Like this: