I can't save Edit user permissions when I press save button the screen displays an error message

'Internal Server Error CDbCommand failed to execute the SQL statement: SQLSTATE[HY000]: General error: 1036 Table 'lime_permissions' is read only
An internal error occurred while the Web server was processing your request. Please contact the webmaster to report this problem.Thank you.'

Please tell me What can I do to solve this problem?

Message is very clear. Check permissions of your DB user from other tool to get more info.

Aestu