When importing a DXF file using ModelBuilder the following error appears:"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
If the original CAD line work was exported to a DXF file, then try saving as a DXF instead.
There may be an issue with the seed/template file that was used to create the original CAD file.
Try copying the linework to a new file that uses a different seed/template file.
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Wiki: Importing A CAD (eg. DXF or DGN) Drawing Using ModelBuilder [TN]
Forum: ModelBuilder Importing 2007 .DXF File - Corruption Error