Error On Screen Rotation

[XichengSpencer]

What I did is change the Button to the Material Button in ResumeLessonFragment.

The error only happens when I rotate the screen and it cause the app to crash, if I stay in portrait/landscape it won't happen.

Here is the error message
java.lang.RuntimeException: Unable to start activity ComponentInfo{org.oppia.android/org.oppia.android.app.resumelesson.ResumeLessonActivity}:
java.lang.IllegalArgumentException: Wrong state class, expecting View State but received class com.google.android.material.button.MaterialButton$SavedState instead.
This usually happens when two views of different type have the same id in the same hierarchy. This view's id is id/resume_lesson_start_over_button. Make sure other views do not use the same id.

I check the usage of the button. There is only a single id reference. It is not used in code, but it is used in several layout files. Since I only make a change button to the material button for 1 layout file, could it be the inconsistent type across the different layout files caused this problem? If I change them all will it be fixed?

[adhiamboperes]

Hi @XichengSpencer. the error message is assentially correct. You have changed the button class in the default layout but not in the landscape or sw-600dp layouts. See below: