Ok guys

finally we nailed out the problem.
One of our sub folders causing this.

First we renamed the folder(just to exclude files in them from build) and build went thru fine.
next we renamed back it to original folder name and copied all its contents (i mean prg,scx etc.,) one after the other and doing build in between.

finally finally we found out the prg that causing the error.
If we just exclude that single prg then build is fine.

Interestingly ,we deleted the whole code in that prg but still get error when we do build !!
Actually there r no syntax errors or anything like that in that prg.we've been using it for years.
Any ideas what could be happening there.
As u know it definetly not with the code in that prg as we blanked out completely but still get error!!
Thanks