ORA-00911: invalid character while typing select name from v$tempfile;

[zakriyamhd]

After a while it works fine,

SQL> select name from v$tempfile;

NAME
--------------------------------------------------------------------------------
/u07/oradata/sreport/wsadatatemp02.dbf
/u06/oradata/srep/wsadatemp01.dbf
/u10/oradata/sreport/wsadatatemp03.dbf.dbf


but why does this keeps hapening each time when I exit and login again with sqlplus "/ as sysdba" into oracle for the first time it throws me this kind of errors