"attempt to call method 'addEventListener' (a nil value)"

[Brdybrbnk]

Hi, I’m trying to make a pool-shot effect on my first app, and I’m having difficulties, the latest one that I can’t figure out is this.  The error is: main.lua:86: attempt to call method ‘addEventListener’ (a nil value)

My code:

[lua]local physics = require(“physics”)

physics.start()

physics.setGravity(0, 0)

physics.setScale( 60 )

local n = 0

–Hiding status bar

display.setStatusBar( display.HiddenStatusBar )

– Setting background color

display.setDefault( “background”, 100,255,250 )

–Code for balls

local Ball = display.newImage(“Ball.png”)

Ball.x = 200

Ball.y = 250

physics.addBody( Ball, “dynamic” )

local Ball2 = display.newImage(“Ball.png”)

Ball2.x = 200

Ball2.y = 50

physics.addBody( Ball2, “dynamic” )

local PlayerChar = display.newImage( “PlayerChar.png”)

PlayerChar.x = 50

PlayerChar.y = 160

physics.addBody( PlayerChar, “dynamic” )

PlayerChar.linearDamping = 0.3

PlayerChar.angularDamping = 0.8

PlayerChar.isBullet = true --force continue collision detection to stop really fast shots from breaking things

PlayerChar = { density=0.8, friction=0.2, bounce=0.5, radius=15 }

target = display.newImage( “target.png” )

target.x = PlayerChar.x; target.y = PlayerChar.y; target.alpha = 0

local function shot( event )

local t = event.target

local phase = event.phase

if “began” == phase then

    display.getCurrentStage():setFocus( t )

    t.isFocus = true

    

    --stop current ball motion, if any

    t:setLinearVelocity( 0, 0 )

    t.angularVelocity = 0

    

    target.x = t.x

    target.y = t.y

    

    startRotation = function()

        target.rotation = target.rotation + 4

    end

    

    Runtime:addEventListener( “enterFrame”, startRotation )

    

    local showTarget = transition.to( target, { alpha = 0.4, xScale=0.4, yScale=0.4, time=200 } )

    myLine = nil

    

elseif t.isFocus then

    if “moved” == phase then

        if( myLine ) then

            myLine.parent:remove( myLine ) --erase previous line, if any

            end

        elseif “ended” == phase or “cancelled” == phase then

            Runtime:removeEventListener( “enterFrame”, startRotation )

        end

        

        local hideTarget = transition.to( target, { alpha=0, xScale=1.0, time=200, onComplete=stopRotation } )

        

        if( myLine ) then

            myLine.parent:remove( myLine )

        end

        

    end

return true

end

PlayerChar:addEventListener( “touch”, shot )[/lua]

[JonPM]

If you remove that line, does the PlayerChar show up on the screen?

[Brdybrbnk]

Yes.

[JonPM]

Can you verify what line 86 is in your main.lua?

[Brdybrbnk]

Line 86 is:

PlayerChar:addEventListener(  “touch”, shot )

[JonPM]

I see it now.  This line:

PlayerChar = { density=0.8, friction=0.2, bounce=0.5, radius=15 }

Is changing the PlayerChar object to a table.  Perhaps you meant to name it PlayerCharBody and add it to the physics.addBody of PlayerChar?  

[Brdybrbnk]

OOOOHHH, I’m dumb… Thanks.

However, now that the error isn’t coming up, it doesn’t respond to touch at all.

I added 2 lines (I’m using the SimplePool sample app as my reference) to the code, now if I click the Player Character it throws up an error saying:

main.lue:68: attempt to index field ‘parent’ (a nil value)

The 2 lines I entered were:

[lua]if ( myLine ) then

–line throwing up the error (line #61 above)

                myLine.parent:remove( myLine ) – erase previous line, if any

            end

–lines I added

            myLine = display.newLine( t.x,t.y, event.x,event.y )

            myLine:setColor( 255, 255, 255, 50 )

            myLine.width = 8[/lua]

[JonPM]

If you remove that line, does the PlayerChar show up on the screen?

[Brdybrbnk]

Yes.

[JonPM]

Can you verify what line 86 is in your main.lua?

[Brdybrbnk]

Line 86 is:

PlayerChar:addEventListener(  “touch”, shot )

[JonPM]

I see it now.  This line:

PlayerChar = { density=0.8, friction=0.2, bounce=0.5, radius=15 }

Is changing the PlayerChar object to a table.  Perhaps you meant to name it PlayerCharBody and add it to the physics.addBody of PlayerChar?  

[Brdybrbnk]

OOOOHHH, I’m dumb… Thanks.

However, now that the error isn’t coming up, it doesn’t respond to touch at all.

I added 2 lines (I’m using the SimplePool sample app as my reference) to the code, now if I click the Player Character it throws up an error saying:

main.lue:68: attempt to index field ‘parent’ (a nil value)

The 2 lines I entered were:

[lua]if ( myLine ) then

–line throwing up the error (line #61 above)

                myLine.parent:remove( myLine ) – erase previous line, if any

            end

–lines I added

            myLine = display.newLine( t.x,t.y, event.x,event.y )

            myLine:setColor( 255, 255, 255, 50 )

            myLine.width = 8[/lua]