I did an incomplete recovery by resetlogs thru RMAN. After that I get the followng errors when I am doing exp and expdp. I have enough space in exported directories. But when I am doing RMAN Full backp, it is finished without any error.
Export: Release 10.2.0.3.0 - Production on Sun Jan 20 09:35:22 2013
Export done in AR8ISO8859P6 character set and AL16UTF16 NCHAR character set
EXP-00002: error in writing to export file
EXP-00000: Export terminated unsuccessfully