why are some apps not working on my Android device?

I have been using WIFI warden which is an android app on my PC (check the installation guide here) and I have never had a problem with it. Last week I decided that I will opt to use on my android Wiko handset. I downloaded it but it's not working. Whenever I open it it gives me a 'WIFI warden app has stopped working' and thus I can't use it. Who has had a similar problem with their android device? What did you do? I need help.

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