Code blocks not working

I am learning how to program using c.i have installed code blocks from the app center and written my first small program.however when i try to build and run it i get the the error i have screen shotted below.please help and remember that i am not much of a computer whiz kid.TIA.

The best place to get support with code::blocks is likely to be their forum:

To help somebody help you, you’ll need to provide more specific information about the exact steps you’re following, the exact program you have written, etc.

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