User token expires?

Hi,

I am accessing the Moodle through a mobile application, but returns the error:

{"Code": "accessexception", "Message", "Access Control Exception"}

The user authenticates through the application, the token and the UserId are saved for other calls.

It is possible that the user token expires?

I've read the documentation Moodle about possible causes, but did not identify the cause likely is causing this error.

Cheers,

Allan Silva