Verify the CAD version of the plan: in order to import a CAD file to Punch, the file must be DXF or DWG version 2004 or older. In my experience, version 2000 works better.
Verify your computer settings: check the language input of your computer (keyboard) => it must be United States or United States International.
External references: many CAD programs create drawing sets with linked documents. For this reason, the floor plans contain hyperlinks called External References. Delete all the external references.
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