Drawings are not opening in Pro-e after they are released to production in WIndchill

I have a problem;

Some of the drawings belonging to certain ECN are released to production in WIndchill. After this when I try to open in PRo-E it's not opening. An error message shows as "can not be retrieved". When I check event manager it says, Download failed after maximum number of retries. I am using Windchill 9.0 (date code 080) & Pro-E wildfire 4.0.

Thanks in advance

Ganaraj