I am having the same problem and as this question was not yet answered, I will post a link to my file here so others can reproduce it. Looks like this website will not accept a .osm file in the answer section, so I will make a sharing link to share this file.

Edit: Here is the .osm file with the same errors as described by OP.

Edit: I was able to fix this error when I replaced the VAV hot water reheat coils with electric reheat coils. The strange behavior is that when I add a VAV reheat coil it appears to add two objects:

1. VAV HW Rht (i.e. the air-side of the reheat coil)
2. VAV HW Rht Coil (i.e. the water-side of the reheat coil)

It looks like the hot water coil is not added as an object that I would be able to add to a plant system. This appears to be a bug of some sort. But also, I am not sure if the following air-side & plant-side set-up for a VAV with Reheat makes sense. Why are there two hot water coils for each VAV with Reheat system? Shouldn't there only be one? Maybe someone can help clarify.