Programmer not responding

I'm getting this error message. Help?

Arduino: 1.8.5 (Windows Store 1.8.10.0) (Windows 10), Board: "Arduino Leonardo"

C:\Users\Dennis\Documents\Arduino\sketch_may22b\sketch_may22b.ino:4:18: warning: character constant too long for its type

Keyboard.println('Written by GeeDees Arduino');

^

In file included from C:\Users\Dennis\Documents\Arduino\sketch_may22b\sketch_may22b.ino:2:0:

C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.10.0_x86__mdqgnx93n4wtt\libraries\Keyboard\src/Keyboard.h: In function 'void setup()':

C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.10.0_x86__mdqgnx93n4wtt\libraries\Keyboard\src/Keyboard.h:96:18: warning: 'setup()::Keyboard_ Keyboard', declared using local type 'setup()::Keyboard_', is used but never defined [-fpermissive]

extern Keyboard_ Keyboard;

^

Sketch uses 5390 bytes (18%) of program storage space. Maximum is 28672 bytes.
Global variables use 226 bytes (8%) of dynamic memory, leaving 2334 bytes for local variables. Maximum is 2560 bytes.

avrdude: butterfly_recv(): programmer is not responding
avrdude: butterfly_recv(): programmer is not responding
avrdude: butterfly_recv(): programmer is not responding
avrdude: butterfly_recv(): programmer is not responding
avrdude: butterfly_recv(): programmer is not responding
Found programmer: Id = "þ"; type = ¸
Software Version = h.

This

Keyboard.println('Written by GeeDees Arduino');

should be

Keyboard.println("Written by GeeDees Arduino");

Single quotes are for single characters

…R