这跟ACAD没关系，问题出在某个二次开发的软件上。出现这个提示是ACAD自动加载程序时出错。

ACAD支持助手中针对这个问题的解决方案：
When you start a network version of AutoCAD, the following error message is displayed:

bad argument type stringp nil’ error

AutoCAD then continues to load and runs normally.

Solution

This error occurs when the Start in folder for the shortcut that starts AutoCAD is a Universal Naming Convention location (UNC path) on the network. The following example shows UNC paths used in the shortcut properties:

Target = \\bilbo\apps\acad\acad.exe /c c:\acad2000
Start in = \\bilbo\apps\acad

One solution to this problem is to map a drive to the AutoCAD folder, and then change the Start in folder to the mapped drive.

To map a drive in Microsoft?/SUP> Windows?/SUP>

In Windows Explorer, click Network Neighborhood and browse to and select the AutoCAD folder on the network drive.
Right-click the AutoCAD folder and choose Map Network Drive from the shortcut menu.
Assign an unused drive letter (For example, T), and then choose OK.
To change the Start in folder for the shortcut that starts AutoCAD

On the Windows desktop, right-click the icon for the shortcut that starts AutoCAD and choose Properties from the shortcut menu.
On the Shortcut tab, change the Start in location to use the mapped network drive. In the following example, T is the drive that was mapped from the AutoCAD folder on the network:

Start in = T:\

Choose OK.
You should now be able to start AutoCAD without encountering the error.