ORA-06553 Error accessing package DBMS_APPLICATION_INFO

I get a error message when I connect to db via sqlplus. Anyone know how to fix this problem?

Thank you.

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Enter user-name: testing
Enter password:
ERROR:
ORA-06553: PLS-801: internal error [56319]

Error accessing package DBMS_APPLICATION_INFO ERROR:
ORA-06553: PLS-801: internal error [56319]

Connected to:
Oracle8i Enterprise Edition Release 8.1.6.0.0 - 64bit Production With the Partitioning option
JServer Release 8.1.6.0.0 - Production Received on Fri Mar 30 2001 - 10:47:11 CST