Debug Find causing field

You can use this in your script, if any field name in your script have a name of non-existing field, console will print its name.

var fieldNames = ["Field1", "Text1", "Dropdown1"];//Put names of the fields you use in your script inside array.
var nullFields = [];

for (var i = 0; i < fieldNames.length; i++){
var fieldName = fieldNames[i];
var field = this.getField(fieldName);
if(field === null){
nullFields.push(fieldName);}}

if(nullFields.length > 0){
var message = "The following field/s name is not correct:\n" + nullFields.join("\n");
console.println(message);}

The exception object contains a "lineNumber" and a "fileName" property. So if all code is placed in a try/catch block,  the line number and source of the error can be printed. 

try{
   ... All Code ...
}catch(e){
    console.println(e.toString() + " - " + e.fileName + " : line# " + e.lineNumber);
}

Unfortunately, no. It used to work like that in earlier versions (like XI), but Adobe decided to change it to this useless error message format, for who knows what reasons, making the lives of developers that much more difficult.