Corridor Modeler Cross Section Labeling error "Object variable or With block variable not set"

When I try running the cross section labeling tool out of the Corridor Modeling window I get an error

Run-time error '91':

Object variable or With block variable not set

I have the options to "End", "Debug", or "Help"

"Debug" opens VBA editor which is far beoynd my experince to use. "End" closes the processes without starting the labeling tool. "Help" opens a help window which hasn't been very helpful.

How can I get cross section labeler to run? I've restarted multiple times and tried creating a new file and copying in the cross sections to a clean file. Any suggestions?

I'm using V8i, Select series 2.

Thanks