expdp ORA-39000: bad dump file specification: ORA-27038: created file already exists

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$ expdp system@PDB01 parfile=exp_full_pdb01.par
Export: Release 12.2.0.1.0 - Production on Fri Oct 12 12:01:56 2018
Copyright (c) 1982, 2017, Oracle and/or its affiliates. All rights reserved.
Password:
Connected to: Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
ORA-39001: invalid argument value
ORA-39000: bad dump file specification
ORA-31641: unable to create dump file "/u01/dbatst2/stage/dump/EXP_PDB01_FULL01.dmp"
ORA-27038: created file already exists
Additional information: 1

Issue:
dumpfiles generated by expdp operation already present

Solution:
Solution1:
use reuse_dumpfiles=y parameter to overwire the dumpfile
Solution2:
delete the existing dumpfiles and restart the export again
Solution3:
Use different directory location to store the generated export file

Solution4:

Use unique naming convention for export dumpfiles

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