Unfortunately app has stopped. On simple signup app when clicking on signup button

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Java

hai..
I Am new to android studio.i am using android studio 2.1.2 version. run my apps in real device (not using emulator).
I have created a simple login sign up app using sqlite database to store datas.
when it comes to signup after i entered required information like email,pswd,confirm password and click on signup button app has stopped suddenly,
Don't know whats the problem checked my coding more times.
Want to whether database has been created or not. where to check my database or some other solution is there to find why my app get crashed.

What I have tried:

tried rooted my mobile but i can't