Display Groups and Physics

Getting Started Newbie Questions
#1

When I do such thing:

self.Group = display.newGroup()  
physics.addBody( self.Group, { density = 0.001, friction = 0.0, bounce = 1.0 } )

I have this error:
File:\Box2D_v.2.1.2\B…\b2Poly…ape.cpp
Expression: area > 1.19209e-07F

How it can be resolved?
[import]uid: 71770 topic_id: 14369 reply_id: 314369[/import]

#2

You can’t turn display groups into physics objects, only actual display objects. [import]uid: 1294 topic_id: 14369 reply_id: 53128[/import]