Since the dataserver page size is 2KB I'm pretty sure it's not possible to drop the 2KB pool (this was mentioned in one of your other threads) so Bret's second option (add memory to increase pool/wash size) would apply.
While it's possible to reduce the size of the 2KB pool to a very small size, this particular error message would tend to indicate the 2KB pool is (still) being used by the dataserver, ie, probably not a good idea to reduce the 2KB pool size too much otherwise these error messages will occur on a frequent basis.