在sco5.0.7上安装了oracle7.3.4，用sqlplus进去的时候报错

bianfz0311

oracle:/u/oracle/product/734/rdbms/admin>;sqlplus sys/manager

SQL*Plus: Release 3.3.4.0.0 - Production on Tue Jun  7 11:12:51 2005

Copyright (c) Oracle Corporation 1979, 1996.  All rights reserved.

ERROR:
ORA-00900: invalid SQL statement


Error accessing package DBMS_APPLICATION_INFO
ERROR:
ORA-00900: invalid SQL statement



Connected to:
Oracle7 Server Release 7.3.4.0.0 - Production

SQL>;


请问为什么？