Nano Every problem Win10

Sketch uses 3954 bytes (8%) of program storage space. Maximum is 49152 bytes.
Global variables use 175 bytes (2%) of dynamic memory, leaving 5969 bytes for local variables. Maximum is 6144 bytes.
avrdude: jtagmkII_initialize(): Cannot locate "flash" and "boot" memories in description

mike_trantham:
avrdude: jtagmkII_initialize(): Cannot locate "flash" and "boot" memories in description

That warning is expected an normal when uploading to the Nano Every. It does not indicate any problem. As long as the upload is successful, just ignore it and carry on. If you are having an error uploading then it is unrelated to this warning and we will need you to provide more information before we can help you with that.