Has anyone encountered this. I tried to export my development schema and receive an "invalid column name" error. It backs up all the tables, then I receive the error.

. . exporting table W_TERR 3 rows exported
. exporting synonyms
EXP-00008: ORACLE error 904 encountered
ORA-00904: invalid column name
EXP-00000: Export terminated unsuccessfully

Any suggestions on how to correct this?