I recently started getting this error in expdp
UDE-00008: operation generated ORACLE error 31626
ORA-31626: job does not exist
ORA-39086: cannot retrieve job information
ORA-06512: at “SYS.DBMS_DATAPUMP”, line 2745
ORA-06512: at “SYS.DBMS_DATAPUMP”, line 3712
ORA-06512: at line 1
If you try to import the file (created with above error) using impdp, you will not see any error. So file itself is correct. This is a known Bug 5969934.