# Shader import problems

**URL:** <https://forum.kirupa.com/t/shader-import-problems/298604>\
**Category:** flash\
**Created:** [October 21, 2009, 7:14pm UTC](https://forum.kirupa.com/t/shader-import-problems/298604 "2009-10-21T19:14:41Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dtk13](https://avatars.discourse-cdn.com/v4/letter/d/7ab992/32.png) [@dtk13](https://forum.kirupa.com/u/dtk13)\
**Post date:** [October 21, 2009, 7:14pm UTC](https://forum.kirupa.com/t/shader-import-problems/298604/1 "2009-10-21T19:14:41Z")

</div>

Hey. I have a class that extends ShaderFilter and I keep getting this error:

```auto
Error: The definition of base class ShaderFilter was not found.

```

as if flash.filters.ShaderFilters doesn’t exist. I’m compiling with flex 3.4. help…