Logging problem

Hi I am having logging issues ,a purple coloured blank screen comes on my phone when I click on Freetrade app, I have downloaded the app a few times but the same happens. It has been working fine for the past 3 months, having problems for the last few days

You have provided no information with which to help. What phone, what OS and version, is the app up-to-date? Etc.

Hi Tony
Sorry for not providing appropriate information
It is iPhone 6s
Version: iOS 14.4.2
The app downloaded is most recent