Error with my Arduino

My Arduino was working fine , suddenly now the program is not uploading to Arduino, i am not able to select the port and
The LED of Arduino simply turn on without blinking when i connect it to the power supply

Below is the error which i am getting while uploading Sketch to Arduino

This is not an introductory tutorial.

Post text, not pictures of text.

Error is
avrdude: ser_open(): can't open device "/dev/ttyACM0": No such file or directory

Aryan_Choudhary:
Error is
avrdude: ser_open(): can't open device "/dev/ttyACM0": No such file or directory

Click "Report to moderator" link and ask them to move this to the appropriate forum. 2 of the first 3 posts in this forum specifically ask you NOT to post your questions in this forum.

@Aryan_Choudhary

DO NOT DUPLICATE / CROSS POST !

Please READ THIS post before adding any more.

Bob.