Table <Tablename> is set to read only, user doesn't have enough rights on this table.
You are logged into the database as a user that does not have the appropriate rights to view the table definition. For example, if you have only SELECT rights to a table and try to view the table definition, then this message appears.
To correct this error
You need the following permissions in order to access the table:
Other permission-related errors may have prevented the table definition from loading in read-write mode. Check for and resolve those errors by contacting the server administrator.