runtime error

local bg=display.newImageRect(“c.png”,200,100);

bg.x=100;

bg.y=150;

bg.alpha=0.6;

physics.addBody(bg,{isSensor=true});

this is my code and i am getting an error  

attempt to index global ‘physics’(a nil value).

Have you got this at the top of your code?

[lua]

local physics = require( “physics” )

[/lua]

yes i forgot to write

thanks

 local physics=require(“physics”);

 local bg=display.newImageRect(“c.png”,200,100);

  bg.x=100;

   bg.y=100;

bg.alpha=0.6;

physics.addBody(bg,{isSensor=true});

function dr(self,error)

self.alpha=self.alpha+0.2;

end

bg.enterFrame=dr;

RunTime:addEventListener(“enterFrame”,dr);

error:attempt to index global ‘runtime’(a nil value).

It’s “Runtime”, and not “RunTime”.

Have you got this at the top of your code?

[lua]

local physics = require( “physics” )

[/lua]

yes i forgot to write

thanks

 local physics=require(“physics”);

 local bg=display.newImageRect(“c.png”,200,100);

  bg.x=100;

   bg.y=100;

bg.alpha=0.6;

physics.addBody(bg,{isSensor=true});

function dr(self,error)

self.alpha=self.alpha+0.2;

end

bg.enterFrame=dr;

RunTime:addEventListener(“enterFrame”,dr);

error:attempt to index global ‘runtime’(a nil value).

It’s “Runtime”, and not “RunTime”.