Error Message, Need help

[Isaac Kwesi Nooni]

system(paste('gzip -d',ff))
      1 [main] gzip 42336 find_fast_cwd: WARNING: Couldn't compute FAST_CWD
pointer.  Please report this problem to
the public mailing list cygwin@cygwin.com

gzip: stdin: unexpected end of file
Warning message:
running command 'gzip -d ' had status 1

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