The SAVE button in fattening and quotes does not work

I create a new invoice, enter all the data, and when I click the save button in the chrome console, I come across these errors. The system saves the invoice number, the customer, but does not save the description, pricing and final calculation.

Failed to load resource: the server responded with a status of 404 (Not Found)
7/fatture/invoices/ajax/save Failed to load resource: the server responded with a status of 403 (Forbidden)
129:295 POST http://www.japita-se.it/fatture/invoices/ajax/save 403 (Forbidden)

You know how to help me use a old version 1.2.7
Thanks a lot

Old versions are not supported, sorry.