# Newbie question - conflict with imported classes?

**URL:** <https://forum.kirupa.com/t/newbie-question-conflict-with-imported-classes/314189>\
**Category:** flash\
**Created:** [September 21, 2010, 9:19am UTC](https://forum.kirupa.com/t/newbie-question-conflict-with-imported-classes/314189 "2010-09-21T09:19:13Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![theMonitor](https://avatars.discourse-cdn.com/v4/letter/t/ecb155/32.png) [@theMonitor](https://forum.kirupa.com/u/theMonitor)\
**Post date:** [September 21, 2010, 9:19am UTC](https://forum.kirupa.com/t/newbie-question-conflict-with-imported-classes/314189/1 "2010-09-21T09:19:13Z")

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An unashamedly naive question, I’m afraid, from someone trying to get to grips with as3 classes…

I have a movie clip (a car) on the stage that’s linked, through the ‘Class’ field in the symbol properties dialogue box, to a class which allows it to move. This works fine, until I attempt to set up collision detection for a movieclip representing the track, by importing a CollisionDetection class; then, the car movement class does not appear to be imported at all. Neither does it appear to work when I include _any_ import statement on the main movie’s timeline.

Could anyone suggest why this might be the case?