进入数据库错误

月光宝盒

linux+oracle9i
输入sqlplus,出现如下错误:

ERROR:
ORA-04045: errors during recompilation/revalidation of SYS.DBMS_OUTPUT
ORA-06508: PL/SQL: could not find program unit being called
ORA-06512: at line 2
ORA-06508: PL/SQL: could not find program unit being called
ORA-06512: at line 2


ERROR:
ORA-04045: errors during recompilation/revalidation of
SYS.DBMS_APPLICATION_INFO
ORA-06508: PL/SQL: could not find program unit being called
ORA-06512: at line 2
ORA-06508: PL/SQL: could not find program unit being called
ORA-06512: at line 2


Error accessing package DBMS_APPLICATION_INFO

Connected to:
Oracle9i Release 9.2.0.1.0 - Production
JServer Release 9.2.0.1.0 - Production
sql>

请问这是什么原因?
如何解决?