Error with new Package

Question

I am trying to retrieve a variable from an .as file from one mxml file, while setting it from another.  I thought I had everything set up, but I am retrieving an error.  1119: Access of possibly undefined property loc through a reference with static type Class. I'm assuming I am missing something, but can't figure out what it is.
Any help is greatly appreciated.
This is how the value is set within the mxml
PickLocation.loc = cboPreviousLocations.value.toString();
I have imported the package.
import   widgets.PickLocation;
The .as file
package  
Bindable] 
public class PickLocation{ 
public var _loc:String;
public function get loc():String {  
return _loc;}
public function set loc(value:String):void { widgets{
_loc = value;

Answer 1

Here is what I have and the error I am receiving.
Error 1042: The this keyword can not be used in static methods.  It can only be used in instance methods, function closures, and global code.
package  
Bindable] 
public class PickLocation{
static public var _loc:String; 
static public function get loc():String {  
return _loc;}
static public function set loc(value:String):void {   *****This is where the error is occurring._loc = value;    }
I'm not following why I'm receiving the error considering I'm not using the this keyword anywhere.