Getting error when defining sampling grid

[Pyingw]

Dear Sir/ Madam,

I got some error message when changing the unit of the sampling grid.
The Matlab version is R2020b.

Yours faithfully.

Describe the bug

Can not change the unit while define sampling grid.

--------- Error Message ----------------
Not enough input arguments.

Error in grid_chooser/UpdateGridPoints (line 349)
if event.Source == app.dx

Error in grid_chooser/UnitsDropDownValueChanged (line 336)
app.UpdateGridPoints()

Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 429)
Error while evaluating DropDown PrivateValueChangedFcn.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Sampling'
2. Click on 'Define Grid '
3. Go to 'Units '
4. Scroll down and click on 'degree ' or 'any other units'
5. See error

Expected behavior
Change the unit to degree and get a sample grid.

Screenshots