G'Day Zack
Did you get a response to this? I've just got the same issue after saving a dynamic culvert design. Can't open Dynamic Culvert Design at all in this project now.
Annotation 2020-08-17 142030.png (17.1 KiB) Viewed 4102 times
It was a data error already inside the dynamic culvert software by a previous user.
I believe we opened it on another person's machine somehow and edited the data that was sending it wonky.