This may happen when your board is not seen by Visual Studio. Check that in your project properties that EMX is seen in the .net microFramework -> Deployement Transport USB and Device is EMX.
I’ve had this happen to me on a number of occasions. Haven’t really been able to place it down to one thing yet.
Things to try:
Are you plugging into a usb3 port? Try using usb2 instead. Admittedly my problems with this are usually related to going into ghi bootloader mode, but it may help.
Delete your bin folder and re-build the project. Starting getting this message constantly once, and the only way to get rid of it it was to do this.
Thank you for your suggestion. I have tried it ever since yesterday . My plugging was in usb and I have plugged into usb2 now. Before clicking “F5” I deleted bin folder and re-build the project. but it seemed debugging didn’t always run successful.
Debugging ran sometimes well without this indication message, and sometimes not well, this indication message happened.
I will try it, I have not updated the latest winusb diver and Sdk. my “Microsoft .NET Micro Framework” is 4.1. I have seen that there is latest Sdk in GHI homepage.