Error while running DBMS_RECTIFIER_DIFF.DIFFERENCES

I am using DBMS_RECTIFIER_DIFF.DIFFERENCES to find the data difference between two tables and receiving the following errors. Does anybody know what could be the reason. The structure of both the tables is exactly similar. I am not getting any error when I run the MINUS between two tables... Any suggestions..

DECLARE
*
ERROR at line 1:
ORA-06550: line 1, column 1361:
PL/SQL: ORA-00904: "FLOWGATE_INFO": invalid identifier ORA-06550: line 1, column 1229:
PL/SQL: SQL Statement ignored
ORA-06550: line 1, column 2579:
PL/SQL: ORA-00904: "FLOWGATE_INFO": invalid identifier ORA-06550: line 1, column 1966:
PL/SQL: SQL Statement ignored

ORA-06512: at "SYS.DBMS_RECTIFIER_DIFF", line 1628
ORA-06512: at "SYS.DBMS_RECTIFIER_DIFF", line 1219
ORA-06512: at line 97

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