# How to use external libraries in CS4?

**URL:** <https://forum.kirupa.com/t/how-to-use-external-libraries-in-cs4/278023>\
**Category:** flash\
**Created:** [December 20, 2008, 9:29am UTC](https://forum.kirupa.com/t/how-to-use-external-libraries-in-cs4/278023 "2008-12-20T09:29:45Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![johnlouis](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/johnlouis/32/568_2.png) [@johnlouis](https://forum.kirupa.com/u/johnlouis)\
**Post date:** [December 20, 2008, 9:29am UTC](https://forum.kirupa.com/t/how-to-use-external-libraries-in-cs4/278023/1 "2008-12-20T09:29:45Z")

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i’m having trouble using external libraries… I have already put the path in my ActionScript 3.0 settings under Preferences… but it says that the class could not be found.