Is it CADWorx 2018? If so, this patch resolves the issue along with the Civil 3D Object Enabler not loading in CADWorx Plant. Here is the link, the fix only works on CADWorx 2018 on AutoCAD 2018.
https://www.dropbox.com/s/ycslkb256u0w5kh/CADWorx2018_C3DOE_fix.exe?dl=0
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