# Errors with base class

**URL:** <https://forum.kirupa.com/t/errors-with-base-class/307349>\
**Category:** flash\
**Created:** [April 2, 2010, 12:19am UTC](https://forum.kirupa.com/t/errors-with-base-class/307349 "2010-04-02T00:19:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jaggera97](https://avatars.discourse-cdn.com/v4/letter/j/f0a364/32.png) [@jaggera97](https://forum.kirupa.com/u/jaggera97)\
**Post date:** [April 2, 2010, 12:19am UTC](https://forum.kirupa.com/t/errors-with-base-class/307349/1 "2010-04-02T00:19:34Z")

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Hello, I am a fairly new AS3 programmer having recently transitioned over from AS2 and I am havin an error with my code that is not allowing me to use external actionscript files. Whenever I use one it automatically will change the base class of my movie clip to a blank space and then when I go to change the base class back it will let me, but then I go back into the properties panel to see that the base class is blank again! This is preventing me from doing a lot of things and it would be so great if someone could help because I couldn’t find any soultions on the internet. Thanks in advance!!!