Retries Login

I am now doing an application that to enter you need to pass through a Login Screen. I did that Login screen and , to strength the App's security I want to create a "Retry" variable, when if you fail 2 times in a row to login, it will send you to another screen and make you wait for 30 seconds before retrying again.  I coded what you see in the screenshot down there.

Problem is,  that when I try my app on my phone, it tells me that I am using a bad argument to "-" , but in others Apps that I saw that used a similar thing as mine it d doesn't do that. 

What should I change? Do? What's the problem? Thanks.

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you are setting your global variable Essais somewhere to the boolean value true

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Where should I put it then? Since it has to know if the login is correct or not.

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Do you mean this?

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Or this?

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Essais should be always numeric, so the second screenshot is the correct one

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It works, thank you very much, Taifun

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