Global variables don't work

In the title there is all the problem:

I've initialized a global variable in the screen 1 with a name and a value,then all ok,it works for that screen but when I tried to get that variable in another screen I cant see it,this problem is current with all global variable and all screens .-.

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Global variables are not passed from one screen to another. Use the block Open Another Screen with Value or TinyDB to pass values between screens.

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