error:an item with the same key has already been added

hi.
i just moved to the april ctp beta 2 version of dts(i know it's already late to do that). i created a new project and moved the packages i did on beta 1 into it. after building it, and when i run the dtsintall.exe, it got this error : an item with the same key has already been added (mscorlib).
what i did is excluded all the packages from the project and ran it for one package it worked..gradually i added a package after the other and build it and it worked..then suddenly the error appeared again and i can't get rid of it even when i go back to my initial state of 2 packages.. i can't understand why it's giving it.

i'm sure someone must have faced this problem. please help!

Thanks
ChristinaHi Christina,

One of the problems could have been that the packages use XML configurations that have the same file name.

This has been addressed for CTP16.

regards,
ash|||Hi Ash. Thanks for your reply.
Is it the file name or the configuration name?
If i change the configuration type will it work?

Thanks
Christina