Error:
<<avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xa5
avrdude: ser_drain(): read error: The device does not recognize the command.
Failed uploading: uploading error: exit status 1>>
the above error was encountered while uploading receiver code while transmitter code got uploaded seamlessly
i am working o IDE version 2.3.2
Make sure the Serial port is not in use in another window. Always retry that error 4 or 5 times, shut down the IDE and retry. If it is Windows, then, unfortunately, you may need to debug the device manager.