Error when I save a record

Hi,

I'm working with Sugarcrm 7.6 pro and I have a big problem when I save a record with the regular user but not with the Admin user.

When I try to save an Account or a Contact record, sugar stops me with this error " There was an error while connecting to the server. Please try again.":

I try to do the same thing with my admin user and there's no problems.

I try to take a look to the log files and this is the report:

php_error.log   :   no error

apache_error.log   :   no error

sugarcrm.log   :   

09/02/16 09:18:47 [13760][29394d50-6289-df31-993a-57c820dd03b0][ERROR] An exception happened: ( 424: ERROR_DNB_CONFIG)Your request failed to complete.
09/02/16 09:18:48 [13760][29394d50-6289-df31-993a-57c820dd03b0][ERROR] An exception happened: ( 424: ERROR_DNB_CONFIG)Your request failed to complete.
09/02/16 09:18:50 [13760][29394d50-6289-df31-993a-57c820dd03b0][ERROR] An exception happened: ( 424: ERROR_DNB_CONFIG)Your request failed to complete.
09/02/16 09:18:51 [13760][29394d50-6289-df31-993a-57c820dd03b0][ERROR] An exception happened: ( 424: ERROR_DNB_CONFIG)Your request failed to complete.
09/02/16 09:18:52 [13760][29394d50-6289-df31-993a-57c820dd03b0][ERROR] An exception happened: ( 424: ERROR_DNB_CONFIG)Your request failed to complete.
09/02/16 09:18:54 [13760][29394d50-6289-df31-993a-57c820dd03b0][ERROR] An exception happened: ( 403: not_authorized)Not allowed to perform action "save" on this record

browser console   :   

sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:29

POST http://localhost/sugarcrm/rest/v10/Accounts?viewed=1 403 (Forbidden)send @ sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:29ajax @ sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:29execute @ sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:38call @ sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:38records @ sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:38sync @ sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:41save @ sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:36save @ sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:40saveModel @ components_8a4e432….js:5405createRecordWaterfall @ components_8a4e432….js:5403r @ sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:37(anonymous function) @ sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:37
sidecar.min.js?v=M6nv9q_bdTkCucHQgJQzng:40

ERROR[2016-9-2 9:30:54]: Not allowed to perform action "save" on this record

Please help me

Best regards

Stefano