# Error 5005: Unknown error optimizing byte code

**URL:** <https://forum.kirupa.com/t/error-5005-unknown-error-optimizing-byte-code/273931>\
**Category:** flash\
**Created:** [October 22, 2008, 5:16pm UTC](https://forum.kirupa.com/t/error-5005-unknown-error-optimizing-byte-code/273931 "2008-10-22T17:16:51Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![bonnieraymond](https://avatars.discourse-cdn.com/v4/letter/b/0ea827/32.png) [@bonnieraymond](https://forum.kirupa.com/u/bonnieraymond)\
**Post date:** [October 22, 2008, 5:16pm UTC](https://forum.kirupa.com/t/error-5005-unknown-error-optimizing-byte-code/273931/1 "2008-10-22T17:16:51Z")

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I got this annoying problem when working with a large project in Flash CS4, while it was work fine in CS3. Can anybody help me with this error?  
btw:  
I know CS4 have improved a lot, but seriouly it’s getting worse! My project has exported in 5 seconds in CS3, and in CS4 it was 30 seconds!!! What happened in CS4???  
And now I’m stuck with this error :jail:  
I moved back to CS3, and it worked very good.:huh: