Save button for new map return "Map not saved"

Hi,

First of all, I try with other site with the same licence, all is ok.
On this site, when I want to save my map, an alert box retrun "Map not saved"
I updateed the plugin, every thing is ok
I compare the ajax request with another site, every thing is similar except the response of course {"status":0,"id":false}
What can I do?

Thanks for help
Régis