Matlab addon explorer not showing

I am using Matlab 2020b, and suddenly the Matlab addon window does not show when I click the addon button.

I get the following error:

Error using matlab.internal.cef.webwindow/errorOnInValidWindow (line 1450)
Webwindow is not valid. It was closed by user or the process was terminated.
Error in matlab.internal.cef.webwindow/bringToFront (line 636)
            obj.errorOnInValidWindow()
Error in matlab.internal.webwindow/bringToFront (line 205)
            bringToFront(obj.impl)
Error in matlab.internal.addons.AddOnsWindow/bringToFront (line 68)
            obj.webwindow.bringToFront();
Error in matlab.internal.addons.Explorer/bringToFront (line 65)
            obj.addOnsWindowInstance.bringToFront();
Error in matlab.internal.addons.launchers.showExplorer (line 134)
            matlab.internal.addons.Explorer.getInstance.bringToFront; 

[Si Zhao]

Have you solved it yet?