It would be hard to say anything sensible about this without seeing a debug file. Usually adapters exit because they cannot find the engine executable. Perhaps it does not understand the backslashes in the filename, and needs slashes.
Also note that UCCI2WB should be considered obsolete now that UCI2WB can mediate UCCI protocol. It was a hack I made of Huang Chen's UCCI2QH, which I did because I could find descriptions of QH protocol, but UCCI was only described in Chinese, in a form resistant to machine translation.