Runtime Error when reading from Firebase to listView

firebase

#1

I am trying to put all "name"s of “patients” in a listView, I am getting this error :
runtime

this is my Database :
firebase

and this is my code :
thunkable

I tried different values in my Database, always the same error.


#2

I had to put the values in a list first and add the list to lis_View1, that was my mistake.