problem in uploading the code
It means there is no proper communication between the IDE and your Arduino. The reason can be many things:


RX/TX UART port used 
USB port broken
USB cable broken
Arduino broken
USB port drivers not properly installed
Problem inside IDE
...


To troubleshoot you could try:


Disconnect RX/TX jumpers
Try another USB port
Remove other USB devices
Try another USB cable
Try another Arduino
Try another PC/laptop
Reinstall IDE
Reinstall USB drivers