AutoCAD Plug-Ins Related FAQ

AutoCAD plug-in installation and usage FAQ

1.Write to file failed, please check if the file is read-only or has insufficient permissions: C:\Program Files\AutoCAD\AutoCAD 2022\Support\acad2022.lsp.

• When registering CAD plug-ins, you need to modify the corresponding version of the acadxxxx.lsp file in accordance with the directory, if the current file attribute is read-only and the program does not have the permission to modify its read-only to editable attributes, or the current path of the folder where the acadxxxx.lsp file is located can not be modified within the folder, there will be this error message. Generally, copy the acadxxxx.lsp file to the path of a logged-in user's working document, similar to: “C:\Users\pc\Documents”, according to the manual registration of plug-ins in the help manual, modify the file, save the modified file and assign the value to the location of the original file. You can do it.

2.CAD plugin crashes in Civil3D software due to new/switching/closing drawings?

• Some users may be using a cracked Civil3D software, and due to the crack itself, it may cause Civil3D itself to crash even when new/switching/closing drawings without the plugin following it, unrelated to the plugin itself.

3.Why is it that I have AutoCAD versions 2021 and 2025 installed on my machine, but I can't read the corresponding versions when registering AutoCAD plug-ins?

• Currently the full range of MLS AutoCAD plug-ins only supports AutoCAD 2022, AutoCAD 2023 and AutoCAD 2024.