Why does this error occur in Dataworkbench?

It would be very helpful to be able to use virtual report suites in Mobile Services as we have 5 apps all passing data into our global report suite. Without this, mobile services only adds value for organisations who use a different report suite for each app. We as a company are reluctant to do this because we want to view our entire digital offering in one report suite and view cross device, cross platform journeys.