上下文从广播接收器进行呼叫时出错

My app checks the date in onResume to see if a method named changeReminder, in the MainActivity, needs to be called. That is, if the date is different from the stored date, changeReminder is called (changeReminder is called from other methods also, such as a refresh button). changeReminder in turn calls the Reminder class which will create a new reminder when the instance is created.My app checks the date in onResume to see if a