Error while Installating of JAVA Add-in

Hi,

I installed ABAP stack on the server and am planning to add the Java Add in for Oracle and I get the following error from the log.

INFO 2005-08-16 14:18:00

Looking for SAP system instances installed on this host...

ERROR 2005-08-16 14:18:06

CJS-20003 While adding instance D00: An instance already exists with that number and a different name or SID: BW1/DVEBMGS00.

WARNING 2005-08-16 14:18:06

The step setDefaults with step key J2EE_EngineEnterprise_Addin_OneHost|ind|ind|ind|WebAS|630|0|J2EE_EngineEnterpriseDialogs|ind|ind|ind|WebAS|630|0|setDefaults was executed with status ERROR.

Kindly let me know what the problem could be due to.

Regards,

Christian..