Hi!
First you have to learn C-Script to understand the errors - so please try some simpler things first...
- the first error means that you somewhere in your code already defined an object/function with the name "crate".
- the second error depends on the other "crate"-object (it's readonly).
- the last error is a spelling-mistake - try "crate" not "create" - sorry - wrote the code without editor/test.
mercuryus
ps: the link you posted is the NEWTON physics-engine. I've heard it's better but I don't know it...