"Attempt to invoke interface method 'voidorg.unimodules...' on null object reference" error message with a React-Native app on an android emulator

My expo app ran fine on ios, but it would crash without an error message on android, so I converted it to a bare react-native app using expo eject and now I am getting this error on my Android emulator. " Attempt to invoke interface method 'voidorg.unimodules.interfaces.taskManager.TaskServicesInterface.setTaskManager(org.unimodules.interfaces.taskManager.TaskManagerInterface,jaka.lang.String, java.lang.String)' on null object reference " Any solutions?