Arduino Uno Rx pin not working (solved)

I changed pin no. from 13 to 0 in blink example and uploaded it without led connected. Upload was successfull.
Now, when I connect led at pin 0, it remains HIGH all time.
When I upload code with led connected, then ide shows me the errors shown in attachment.
Please help me…

(I changed the code for pin 1 accordingly and ran it with same setup and it worked. So I think, there is atleast no error in electrical connections.)

PLEASE IGNORE THIS POST. It was mistake on my part (ran code for pin 1 with led connected to pin 0). I apologise for wasting your time.

It's best not to use pins 0 and 1 as they are Serial Comms and used for uploading code.