Create Sleepers (well those are called TIES)- incorrect prompt?

Hello,

I have used Create Sleepers in the past, it was working.

Now when  I open the dialogue, enter parameters for standard scalloped concrete ties, the pesky prompt attached to the cursor keeps asking SELECT EXISTING RAIL TRACK instead of Select Track Centerline.

When I try to select track alignment in 2D, it says 'Element is in a model not allowed for this tool'. If I select in 3D model, it says 'Element not valid for the tool'. Is there any sane way to figure this out, which model to use, which element to use????? 

There is PDF in the training dataset but it says nothing about what model to use for this routine and what elements are qualified for it. 

Another thing: I have alignments in 2D model. If I need them in 3D, how do I transfer them into 3D? What a mess.....

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