ajax don't run on google cloud hosting - ajax

I have a google cloud compute engine VM instance, I'm already installed apache2 and PHP, I upload my webpage, my index.php is a login page, on my code, when I click my submit button (login) I call with ajax (POST method) mi login.php for validating the user and pass, but I never have answer, the ajax never call my login.php, it returns a 500 internal server error. I'm adding two images with the error and the code where I have this error.
Do I need to install something more on my VM instance? what I'm doing wrong?
This is the error:
And this is the code with error:

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