A conflict exists with definition leftIdle1 in namespace internal - actionscript-3

Question

I'm scripting a game with Actionscript 3.0 in Flash Professional CS5.5, but I get an error.
Scene 1, Layer 'as2', Frame 153, Line 4 1151: A conflict exists with definition leftIdle1 in namespace internal.
(I get these with the other Variables too.)
Now it's a platform game, and I am going to put cutscenes throughout in the game and I need to switch from frames and put the code in another frame. But it gives that error, I turned off the 'Automatic Declare stage instances' function, now I checked this website and Googled it, people get it with their Movieclips, I get it with my variables.
This is my script:
var leftKeyDown1:Boolean = false;
var rightKeyDown1:Boolean = false;
var spaceKeyDown1:Boolean = false;
var leftIdle1:Boolean = false;
var rightIdle1:Boolean = true;
var mainSpeed1:Number = 4;
player.addEventListener(Event.ENTER_FRAME, moveChar);
function moveChar(event:Event)
{
if (leftKeyDown1)
{
player.x -= mainSpeed1;
leftIdle1 = true;
rightIdle1 = false;
player.gotoAndStop("walk_left");
}
if (rightKeyDown1)
{
player.x += mainSpeed1;
rightIdle1 = true;
leftIdle1 = false;
player.gotoAndStop("walk_right");
}
if (rightIdle1 && !rightKeyDown1 && !leftKeyDown1)
{
player.gotoAndStop("idle_right");
}
else if (leftIdle1 && !rightKeyDown1 && !leftKeyDown1)
{
player.gotoAndStop("idle_left");
}
if (collide.hitTestObject(player))
{
player.x = player.x + mainSpeed1;
}
if (trigger1.hitTestObject(player))
{
son1.gotoAndStop("walkRight");
trigger1.gotoAndStop(2);
son1.x += 2;
}
if (trigger2.hitTestObject(player))
{
gotoAndPlay(4);
}
}
stage.addEventListener(KeyboardEvent.KEY_DOWN, checkKeysDown);
function checkKeysDown(event:KeyboardEvent)
{
if (event.keyCode == 37 || event.keyCode == 65)
{
leftKeyDown1 = true;
}
if (event.keyCode == 39 || event.keyCode == 68)
{
rightKeyDown1 = true;
}
if (event.keyCode == 32)
{
spaceKeyDown1 = true;
}
}
stage.addEventListener(KeyboardEvent.KEY_UP, checkKeysU1);
function checkKeysUp(event:KeyboardEvent)
{
if (event.keyCode == 37 || event.keyCode == 65)
{
leftKeyDown1 = false;
}
if (event.keyCode == 32)
{
spaceKeyDown1 = false;
}
if (event.keyCode == 39 || event.keyCode == 68)
{
rightKeyDown1 = false;
}
}
It's probably coded in a weird way, but whatever.
I have no idea what to do at this point.
Help would be really appreciated.
EDIT:
Oh I got another error too. It's with Duplicate function, and I can't seem to fix it but to rename those, and it will take a long time to rename them every-time. So if someone has something for that, thanks!

Answer 1

you have duplicated definitions.
For example:
var leftIdle1:Boolean
exists multiple times - remove the duplicates