gives a proper error message if the specified id does not exist
gives a proper error message if the specified id does not exist

Smoss/Enoru-eco,gopalindians/melonJS,melonjs/melonJS,srbala/melonJS,TukekeSoft/melonJS,rlugojr/melonJS,TukekeSoft/melonJS,gopalindians/melonJS,MarkoIvanetic/melonJS,rlugojr/melonJS,melonjs/melonJS,MarkoIvanetic/melonJS,rlugojr/melonJS,srbala/melonJS,Smoss/Enoru-eco,srbala/melonJS,TukekeSoft/melonJS,gopalindians/melonJS