Excel extractor produces error "Error 8 when compiling the upload program"

I am trying to test a new Excel extractor I've created but when I do so I get the following error:

RSAR233

Error 8 when compiling the upload program: row 446, message: A newer version of data type /BIC/B0000788000 was

I've tried reactivating transfer structures and transfer rules but with no success. When I activate the transfer structures I can see in the status bar briefly a message refering "Activating Structure /BIC/B0000788000". I am assuming it's the technical name of the structure which supports the extraction.

Any ideas?

Thanks for the help.