Also Nainesh,
Check transport tool from SPAM. Check trans directory is accessible or else download a new package again from market place.
Check below KBA
97633 - @1B@OCS Help: SPAM Step DISASSEMBLE
This says..
SPAM failed to generate the cofile from the corresponding R3trans data file for one of the following reasons:
a) <sys>adm does not have write authorization for the cofiles directory.
b) The value parameter "transdir" in file /usr/sap/trans/bin/TPPARAM is different from that of profile parameter DIR_TRANS.
c) The transport program tp is defective or has a wrong version.
d) Due to obsolete files in /usr/sap/trans/tmp tp appears to be running indefinitely.
- e) The data file does not exist.
Regards,