AS3 Errors 1180 and 1046 - actionscript-3

Question

I am new to AS3 and still trying to understand it. I am trying to import a class from a different .as file in my main .fla file. I know that the errors are the result of me trying to reference a class that the .fla file doesn't have.
Scene 1, Layer 'Code', Frame 1, Line 6 1180: Call to a possibly undefined method bg.
Scene 1, Layer 'Code', Frame 1, Line 6 1046: Type was not found or was not a compile-time constant: bg.
Scene 1, Layer 'Code', Frame 1, Line 4 1172: Definition thebackground:bg could not be found.
Scene 1, Layer 'Code', Frame 1, Line 4 1172: Definition thebackground:bg could not be found.
it probably has something to do with me importing incorrectly, but what that mistake may be I can't say I have any idea. I added a constructor to instantiate bg (at least I think I did.) Will continue to scout for more info, but everything I've found hasn't been anything that I can gather a working result from.
with that said, here is what I have thus far:
import flash.events.EventDispatcher;
import flash.events.Event;
import flash.events.KeyboardEvent;
import thebackground.bg;
var testbg:bg = new bg;
var leftPressed:Boolean = false;
var rightPressed:Boolean = false;
var upPressed:Boolean = false;
var downPressed:Boolean = false;
testbg.moveBackGround();
This is what I have in my main .fla file at present.
package thebackground
{
import flash.events.EventDispatcher;
import flash.events.Event;
import flash.display.MovieClip;
public class bg extends MovieClip
{
var xScrollSpeed:int = 10;
var yScrollSpeed:int = 10;
public function moveBackGround(event:Event):void
{
if(leftPressed)
{
BG.x += xScrollSpeed;
}
else if(rightPressed)
{
BG.x -= xScrollSpeed;
}
else if(upPressed)
{
BG.y += yScrollSpeed;
}
else if(downPressed)
{
BG.y -= yScrollSpeed;
}
}
}
}
and this is what is in thebackground.as