[Koha] gcannot extract koha download using gunzip

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.