This is a program which, behind the calculator, stores files that it deems important. The message field of the error I believe is not his, but the Super SU or Android system, because every time in any program that has to have a deeper access it opens the same field style saying that granted permission. But this time an error occurred. Could someone help me solve this problem?
The error you entered indicates that somewhere in your code you are doing str1.equals(str2); and str2 is a null object, ie you are referring to a null object.
Check your code for the places where you are using the equals method to find where your error is.
Example that will give the error:
String str1 = "teste";
String str2 = null;
boolean ret = str1.equals(str2);