The compiler can't resolve the identifier (a variable name, constant value, etc) as it's missing or is invalid.
Possible solutions: write the correct identifier:
00A5: 0@ = create_car # at 0.0 0.0 0.0 // error, model name not found
00A5: 0@ = create_car #PONY at 0.0 0.0 0.0 // OK