Scheduled exports with 8.1.7

Hello

I have troubles to run a scheduled export batch under Oracle 8.1.7 (Windows NT 4.0/SP5)
- When i'm running the export.bat from the command line, anything works fine.
- When i'm using the following AT-Command to schedule this batch, nothing works anymore

    at 23:00 /interactive /every:mo cmd /c .....\Export.bat

Thanks for any help,
Fredy

• export.bat *****

set ORACLE_SID=TEST
svrmgrl @.....\export.sql

• export.sql *****

connect internal;
shutdown immediate;
startup restrict;shutdown normal;
startup restrict;
host exp .....
alter system disable restricted session;

• Oracle-Trace *****

Dump file ORA00151.TRC
Tue Apr 10 18:56:00 2001
ORACLE V8.1.7.0.0 - Production vsnsta=0
vsnsql=e vsnxtr=3
Windows NT Version 4.0 Service Pack 5, CPU type 586 Oracle8i Release 8.1.7.0.0 - Production
JServer Release 8.1.7.0.0 - Production
Windows NT Version 4.0 Service Pack 5, CPU type 586 Instance name: test

Redo thread mounted by this instance: 1

Oracle process number: 0

151

• 2001-04-10 18:56:00.812 FATAL ERROR IN TWO-TASK SERVER: error = 12571
• 2001-04-10 18:56:00.812 ksedmp: internal or fatal error Current SQL information unavailable - no session. ----- Call Stack Trace ----- ..... ----- End of Call Stack Trace -----

  ---

  Files currently opened by this process:

  ---

  PROCESS STATE

  ---

  Process global information: process: 0, call: 0, xact: 0, curses: 0, usrses: 0 No process is allocated. END OF PROCESS STATE