Thanks for your response.
There was no error returned. It just got failed with 0 exit code. Today i removed the CIT folder from server and then “uninstall scanner” becomes relevant so i uninstalled the scanner. installed it again using “install or upgrade scanner”. After than “initiate software scan” becomes relevant and completed successfully but “upload software scan” is not relevant and is returning relevance 2 and 4 as false,
Strangely again "install scanner ", “uninstall scanner” and “initiate software scan” all the fixlets are showing not relevant.
It looks like something is interrupting scanner.