Can't pass null for argument 'pathString' in child() at com.google.firebase.database.DatabaseReference.child(Unknown Source:40)
49
What is a NullPointerException, and how do I fix it?
63521
How to pass a nullable type to a P/invoked function
54938
Cannot invoke method or retrieve property from null object. Object returned by the following call stack is null. \"File\r\n\"
20020
NullPointerException accessing views in onCreate()
68222
Reference to undeclared entity exception while working with XML
40818
What is an IndexOutOfRangeException / ArgumentOutOfRangeException and how do I fix it?
33103
How come invoking a (static) method on a null reference doesn't throw NullPointerException?
13711
java.lang.NullPointerException at org.glassfish.hk2.classmodel.reflect.impl.TypesImpl.getType
153563
putExtra treeMap returns HashMap cannot be cast to TreeMap android
43769
How do I Parameterize a null string with DBNull.Value clearly and quickly
136408
What does the mysqli_error() expects parameter 1 to be mysqli, null given mean?
32059
What is \null and when do we need to use it?
156400
NullReferenceException when using NUnit
8283
Why does null reference print as "null"
134010
Can Visual Studio tell me which reference threw a NullReferenceException?
66891
How to deal with the URISyntaxException
75428
LINQ to Entities does not recognize the method 'System.String ToString()' method, and this method cannot be translated into a store expression