i hve increased the PDS but still getting the same error.
I can think of only two ways to interpret your statement:
1) you don't understand written English and increased the space allocation for the PDS without changing the directory block allocation, in which case you did nothing to solve your problem.
2) you copied the PDS to another PDS that you allocated with more directory blocks and you still ran out of directory blocks, in which case you need to repeat the copy process with MORE directory blocks.
Unless your site has a tool like PDS 8.6 from the CBT tape, which allows increasing directory blocks in a PDS, you cannot fix your problem without allocating a new PDS (with mroe directory blocks), copying your current PDS to the new PDS using IEBCOPY or similar tool your site has, and optionally deleting the old PDS so you can rename the new PDS to the old name.