There can be multiple reasons why an App can crash:
1. You have not enough free space on your mobile phone. Please check.
2. The App can have a defect. In this case, to help our development team to fix the problem, please provide the details about operating system, iOS or Android version, phone model, crash issue and all the steps you have taken before the crash. This will help us investigate the problem and we will be able to fix it as soon as possible.