I tried the calendar-appengine-sample on google calendar api java sample and when I used the client_secrets.json for running in localhost it always give me back my calendar list, but when I use the client_secrets.json to be run on google app engine, it give me following error message :
ERROR: 401
{
"code" : 401,
"errors" : [ {
"domain" : "global",
"location" : "Authorization",
"locationType" : "header",
"message" : "Invalid Credentials",
"reason" : "authError"
} ],
"message" : "Invalid Credentials"
}
Before it work with the same client_secrets.json, but suddenly it doesn't work. Would anyone be so kindly tell me how to fix this problem?
thanks.