System Information
Operating system: Windows 10 64-bits
Graphics card: RTX 2070 super

Blender Version
Broken: 3.00 release

Worked: 2.93. And probably any older versions other than 3.00.

Short description of error
When I create a landscape with the A.N.T. Landscape add-on then click on Landscape Eroder button, there is no vertex groups generated. It works fine on older versions but not on 3.0.

Exact steps for others to reproduce the error
Open the attached .blender file with 3.0.0 version.
In tool bar on the right side, under Landscape Tools, click the Landscape Eroder.

The following error will occur:

And no vertex group will be generated.

This is what it looks like on 2.93 version.

Thank you for your time!