Physics Editor Problem + "back argument#1 to unpack"

I am getting this error.
[import]uid: 69204 topic_id: 26896 reply_id: 326896[/import]

So what is line 95 in shapedefs.lua?
It appears that a variable being passed to unpack() doesn’t contain the right data - it should be a table but it is getting ‘nil’ - IE undefined.
Given the name of the file, I’d suspect you either tried to reference a non-existing shape, or the data is corrupt somehow. [import]uid: 46639 topic_id: 26896 reply_id: 109165[/import]

This usually happens when you try to retrieve a physics body which does not exist. Please check if the name you specified for

[lua]physicsData:get(“objectname”)[/lua]

exists in the file.

[import]uid: 9611 topic_id: 26896 reply_id: 109168[/import]