This error occurs on my real device. Although I delete app & data, reinstall app, reset all setting & content on my iPhone, it still error. But it run normally on simulator. Anyone have same problems please help me!
The iPhone is case-sensitive , the simulator is not. So there's probably a typo on the key , but this error occurs only when running on the real device.
You have to write the correct name of the key to solve the issue.