[Koha] gcannot extract koha download using gunzip

[kenneth rotich]

 Hi everybody
  
  I installing koha 2.2.9 but i  am getting error when trying to extract the file  using gunzip. I have used the following command to extracting the files  
# tar -xvf koha-2.2.9.tar.gz  
but this is what iam getting
  
  gzip: stdin: unexpected end of file
  tar: Unexpected EOF in archive
  tar: Unexpected EOF in archive
  tar: Error is not recoverable: exiting now. 
 can somebody tell me what i am not getting right and how to go about it.
        
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