Fujitsu PFU Rack2-Filer User Manual page 441

Raku2 ImageWriter is processing job. Please wait until the job is
completed, and try again.
Solution If another binder is importing files, wait until the importing
process is completed and try again.
If this error message appears even though no other binders
are importing files, Raku2 ImageWriter may have closed
abnormally. Restart the system. If the error still remains, there
may have been a Rack2-Filer installation failure. Re-install
Rack2-Filer.
Rack2-Filer User's Guide
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