Error loading plugins. DxfDwgFileFormat.aip
I'm unable to open or export files as dxf or dwg formats due to error loading plugin. i'm using 64-bit operating system, x64-based processor Windows 10 Pro computer. i have tried reinstalling illustrator, but shows the same error. Please Help.
I have even tried using the adobe clean-up tool and installing illustrator again, but still get the same error.

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Patrick Charrier commented
I have the exact same issue since updating to 25.4.6 on a 2013 Mac pro running Mojave 10.14.6
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David Becker commented
The same things happens for me.
Once I updated Illustrator from version 25.4.5 to 25.4.6 on my Mac (which runs macOS Mojave 10.14.6) I get the "Error loading plugins. DxfDwgFileFormat.aip" dialogue box every time I launch the program.
Also the update has broken the entire workspace. Switching to Illustrator using Command-Tab (as I always do) only makes the panels I have docked to the right hand side of my screen visible. The rest of the program doesn't come to the foreground.
So no Application Frame, no Advanced Toolbar, and no menus.
This supposed minor update is a mess. I'll be reverting to version 25.4.5 immediately.
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Martin Sretr commented
The same issue on MacPro, macOS Mojave 10.14.6.
After automatically updating Illustrator to version 25.4.6, the DxfDwgFileFormat.aip plugin cannot be loaded.