The error message says that your tar file can't be read by tar. Possible explanations are:

1. you have compressed your archive and try now to untar it before uncompressing it - that can't work

2. you have transferred the file using ftp and did not use *binary* transfer

3. your disk has an error on a sector the archive occupies

and other problems similar to these.

BTW: entering "0511-169" into google brings an explanation as the first hit - you are required to put in at least a *little* effort in finding the answer yourself before asking here.

bakunin