Assignment not available now

Hi,

I use the javascript api to login, like this : AssignmentManager.login(url, username, hash, loginCallback)

And to get the activity, i call to ap JS :

var login = "j_username=" + username + "&hash=" + hash + "&loginAs=" + loginAs;

http://localhost:8081/jw/web/client/app/assignment/733_271_intervention_processusIntervention_demandeIntervetion + "?" + login;

where username is the admin system and loginAs is the user.

Up to here everything is good. i get well the activity on the console.

----> The problem is when  i click on "complete button" to submit the form, i have the following message :

Assignment not available now.

It is likely that the assignment has already been completed.

Any idea ?

Thank's