Paul,
Yes ..Job is corrupted and "CopyOf" Job did not work either.We haven't look much into local install of the client code as the issue started while I am connected via VPN. and rest all jobs were fine.
No worries ..May be Its because I did not emphasize enough on one job during my replies .I also checked the option of recover the job but DS Admin says there is no recover in datastage currently we have .(Not sure does it meant in DS itself OR in our project we have to setup for this).That leeds next question ,how can we recover the job ? (in case of corrupted scenarios like mine )
Oh I see ..I thought there may a other option than backup .. I do take the backups but that job was just brand new and issue happened soon after creation
Anyways Thank you everyone for the contribution in this discussion .I am closing the post .