Print jobs fail because PPD file can't be opened in RHEL

Issue

• On one of the servers, jobs are spooled, but they don't go to the printer. We restarted CUPS, but did not seem to help.
• Our production printer is no longer functioning. We're getting an error message "Job stopped due to filter errors"
• When we print from the server the job status says "Data file sent successfully". But if you view the queue status, the status will be "Stopped" with the error "/usr/lib/cups/filter/foomatic-rip failed".

• CUPS isn't working and we see the following messages in /var/log/cups/error_log:

  D [19/May/2016:08:39:21 -0500] [Job 293] foomatic-rip version 4.0.4.217 running...
  D [19/May/2016:08:39:21 -0500] [Job 293] Process is dying with "Unable to open PPD file /etc/cups/ppd/test.ppd
  D [19/May/2016:08:39:21 -0500] [Job 293] ", exit stat 9
  

• Print jobs are failing and when we set "LogLevel debug" in cupsd.conf, we see the following messages:

  D [13/Mar/2019:15:48:47 +0000] [Job 1167] : ERROR: Unabel to read PPD File
  D [13/Mar/2019:15:48:47 +0000] PID 4194 (/usr/lib/cups/filter/hpps) stopped with status 1!