Warning while opening matlab R2018b

I bought a new computer and installed matlab (acdemic use) when i opening Matlab I find this Warning.

I'll attach the command window copy and paste (everything is printed in orange):

Warning: The following error was caught while executing 'internal.hotplug.EventSource' class destructor:
Dot indexing is not supported for variables of this type.not supported for variables of this type.

Error in internal.hotplug.EventSource/stop (line 69)
            obj.Channel.close();

Error in internal.hotplug.EventSource/delete (line 53)
            stop(obj);

Error in internal.hotplug.EventSource (line 34)
        function obj = EventSource()

Error in internal.deviceplugindetection.Manager (line 173)
        obj.USBDetectorObject = internal.hotplug.EventSource();

Error in internal.deviceplugindetection.Manager.getInstance (line 246)
            devicePluginManagerInstance = internal.deviceplugindetection.Manager();

Error in matlabrc (line 86)
        pl = internal.deviceplugindetection.Manager.getInstance(); 
> In internal.hotplug.EventSource (line 34)
  In internal.deviceplugindetection.Manager (line 173)
  In internal.deviceplugindetection.Manager.getInstance (line 246)
    In matlabrc (line 86) 

what the problem and how fix that?

[Walter Roberson]

What shows up for

which -all matlabrc

It would most often only show toolbox/local/matlabrc.m under your installation directory, and that file does not have any plugin detector anywhere, let alone line 86