cups — fixing cups printer problem: client-error-not-found 
Recently, my CUPS server crashed when I tried to print a pdf document. Strangely, the default printer, CUPS/printer, was replaced by CUPS/abort-job! Accessing GNOME printer configuration under Fedora Linux produced the following CUPS server error message.
There was an error during the CUPS operation: 'client-error-not-found'
Here is a screenshot of that error.
Fortunately, the solution to this problem was very simple. Restarting the CUPS server, using the following command, fixed the problem.
sudo /etc/init.d/cups restart
The CUPS server was stopped and then started again, as shown in the output below.
Stopping cups: [ OK ] Starting cups: [ OK ]
The default printer was restored and everything started working again. If you are having more problems with CUPS, then this article might help: cups — fixing cups printer problem: lpd failed.
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