Error while load dxf:“The specified conversion is invalid” about dxf HOT 6 CLOSED

It sounds like there was an unexpected value in the DXF file. Can you share the file with me so I can investigate? If not, was there a file and line number reported with the exception? This won't tell me what the unexpected value was, but it could tell me where it happened so we might be able to guess what happened.

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of course,here is dxf file:
autocad_2007.zip

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look forward to your reply.

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What software created this file? The file name indicates AutoCAD 2007, but the value of the $ACADVER variable suggests AutoCAD 2018 or 2019.

The real issue, though, is the header variable $ACADMAINTVER which according to the spec should be a code 70 (short) value, but the file you provided lists a code 90 (long) value, which doesn't conform to what's supposed to be in the file. If you open up the file in Notepad or another text editor you can see the code 90 listed on line 11; this should be 70. Manually changing that value allows the file to open, both in the version that's hosted on NuGet as well as the latest sources from master.

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Thanks for your reply.
got it

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What software created the DXF file? The indentation suggests that it was something not custom written or off the cuff. If it's something that others are likely to use I want to make sure that my library works with it appropriately.

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