Cannot save sales quote after editing

We are facing a problem, cannot update after finish editing sales quote.

Manager version 18.7.36

Please help.

This is “read only” error coming form SQL library. I will need to improve the look of this error but basically what it means is that your database is in “read only” mode. This happens when you have another process (e.g. backup app or sync app) accessing your database as you are working with Manager. When making changes to database (such as saving new quote), Manager needs exclusive access and if it cannot obtain it, error occurs.

Usually this will resolve on its own when the process holding the lock on your database releases it (after backup or syncing is done) so Manager can make changes to database again.