ORA-29913: error in executing ODCIEXTTABLEOPEN callout

ORA-29913: error in executing ODCIEXTTABLEOPEN callout

Yesterday I was worked in db migration to export the schema & import into another database.
I have faced some issues. I would like to share you.
Database version is 10.2.0.4 & server is IBM AIX 5.3. Schema size is around 25 GB. So I am using Datapump & got the below error.

ORA-31693: Table data object "MANOJ"."RB_TABLE" failed to load/unload and
is being skipped due to error:
ORA-29913: error in executing ODCIEXTTABLEOPEN callout
ORA-39077: unable to subscribe agent ORA-39077: unable to subscribe
agent KUPC$A_1_20101210

I have checked several URL & they told its related to external table. But my table is a normal table.
I got only error for "MANOJ"."RB_TABLE" & remaining tables were exported successfully.
I got parallel parameter having issue. While export using expdp I used parallel=6 parameter.
Again I have tried parallel =2, 3, 4 & got the same error.
Finally i set parallel=1 (default value – No need to mention while export using expdp) & exported successfully.

Note:

My server having 16 CPU’s & my database side parallel slave’s are available..