I have uninstalled and reinstalled several times but still get the same problem. I am new to iphone.
What version of iOS is installed on your iPhone5? I had no problems installing Live on iPhone5.
iOS 10.3.3
Interesting. I also have 10.3.3.
Have you installed Thunkable Live version 51 from the AppStore? Has it been installed normally, but does the error shown appear on startup?