Lotus Notes and Callpilot

I’m trying to use Callpoint 2.5 with Lotus Notes but there is an error message that keeps coming up which says “DBUs cannot be shared between processes” when I open Callpilot in the Views section in my Mail. This keeps on popping up all the time on numerous ocassions. Does anyone know what is DBUs? This problem never happened when I was using Callpilot with Lotus 7.0. I need help please.

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Subject: Lotus Notes and Callpilot

but the message pops up from Lotus notes itself, I want to know what are DBUs.