Unable to make an opportunity (a job at quote status) live.
It could be that your user account permissions do not allow you to create live jobs.
It could be that the client (your customer) is still a prospect. You cannot create a live job for a prospect - your customer must be a full client. You will be asked for an account code when you promote a prospect to a client - this should match the code used in your accounts system.
Change your user permissions (contact your local Synergist administrator) and make sure your customer is a full client in Synergist.