Conversion

I am fresher let me say sorry in advance if I ask u very simple question…
I am working on Conversion where database is converting from Nav4.0SP3 to NAV 2009…I am working on Merget Tool…I have exported the NAV4.0 Base object file and NAV4.0 Customized file when I am importing the NAV4.0 Base file in Merge Tool I am getting an error which says…
“The Application Objects already Exists.
Identification Fields and Value
Version=MERGETOOLPM112’,Object Type=‘Table’, Object Number=‘2000000002’”
If anybody knws please let me knw.
How should I go further with merge tool.

Thanks in advance.
Arnav[:)]