I found the problem and also the solution. "Thank you" goes to Mr. Charles Bacon for pointing me to the right direction.
The file $GLOBUS_LOCATION/var/lib/perl/Grid/GPT/LocalEnv.pm defines locations for gtar, gzip, etc. Gunzip was listed as "NOT_DEFINED" or something like that and therefore the file globus_simple_ca_xxxxxxxx_setup-0.19.tar.gz could not be unzipped. Editing the correct path on the file LocalEnv.pm to gunzip solved the problem. Thank you, Mikko Vilenius
