Access of undefined property _btn (problems with all my buttons)

i keep getting error:

scene 1, layer 'actionscript', frame 1, line 1

1120: access of undefined property tennis1_btn.

scene 1, layer 'actionscript', frame 1, line 7

1120: access of undefined property tennis2_btn.

scene 1, layer 'actionscript', frame 1, line 13

1120: access of undefined property tennis3_btn.

scene 1, layer 'actionscript', frame 1, line 19

1120: access of undefined property tennis4_btn.

scene 1, layer 'actionscript', frame 1, line 25

1120: access of undefined property tennis5_btn.

scene 1, layer 'actionscript', frame 1, line 31

1120: access of undefined property tennis6_btn.

 

here screen print of code

i'll paste below:

 

tennis1_btn.addeventlistener(mouseevent.click, gotennis1);

 

 

function gotennis1(event:mouseevent):void {

          var gotennis1url:urlrequest= new urlrequest ("juniortennis.php");

          navigatetourl(gotennis1url,"_parent");

}

tennis2_btn.addeventlistener(mouseevent.click, gotennis2);

 

 

function gotennis2(event:mouseevent):void {

          var gotennis2url:urlrequest= new urlrequest ("adulttennis.php");

          navigatetourl(gotennis2url,"_parent");

}

tennis3_btn.addeventlistener(mouseevent.click, gotennis3);

 

 

function gotennis3(event:mouseevent):void {

          var gotennis3url:urlrequest= new urlrequest ("http://abbottsports.com/membership/memberships.php#tennis");

          navigatetourl(gotennis3url,"_parent");

}

tennis4_btn.addeventlistener(mouseevent.click, gotennis4);

 

 

function gotennis4(event:mouseevent):void {

          var gotennis4url:urlrequest= new urlrequest ("staff.php");

          navigatetourl(gotennis4url,"_parent");

}

tennis5_btn.addeventlistener(mouseevent.click, gotennis5);

 

 

function gotennis5(event:mouseevent):void {

          var gotennis5url:urlrequest= new urlrequest ("calendar.php");

          navigatetourl(gotennis5url,"_parent");

}

tennis6_btn.addeventlistener(mouseevent.click, gotennis6);

 

 

function gotennis6(event:mouseevent):void {

          var gotennis6url:urlrequest= new urlrequest ("tenniscourts.php");

          navigatetourl(gotennis6url,"_parent");

}

 

please help:  have couple of them types of menus 1 giving me problems.  here website i'm using them on:

www.abbottsports.com  working

http://abbottsports.com/football/football.php working

http://abbottsports.com/motocross/motocross.php working

 

i adding on our tennis page. copied flash files tennis folders , renamed tennis instead of football including buttons can see on right side of page in photo.

 

i'm pretty sure has me renaming button, because never changed in code except replacing word football tennis in every spot. , renamed buttons tennis instead of football.

 

thanks assistance.

while expect different error code (since directly targeting buttons (a 1009 error), guess have not changed names of of instances of buttons on stage.  check names assigned them in of layers , keyframes

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