Connection problem Arduino uno

Hello, I have a problem when doing Arduino Uno's timer I don't know why it is not correcting me that it is not correctly related how can I fix this problem?

Hi,
welcome.
I see this is your first time posting here on the forum.
Your post describes your difficulty, but does not give us any solid information to help you.
I don't know if you read the recommended topic when subscribing to the forum:

If you haven't read it, I strongly recommend that you do and that after reading it, redo your post giving clear and useful information
so that we can help you and solve your difficulty.

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