Unable to Compile Model

I enjoyed learning about this app. I wanted play with the preview mode and went online to look for some corn hole boards. I tried adding a few to see what the model could pick out. I attached one that that I was certain would work, but I got a message about Unable to Compile Model. Each one game me this error. What is the issue?
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What error did you see? What is the version of your Xcode? Also, what is the version of your macOS?
Unable to Compile Model
 
 
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