# Cannot create property

**URL:** <https://forum.kirupa.com/t/cannot-create-property/325156>\
**Category:** flash\
**Created:** [September 28, 2011, 10:40pm UTC](https://forum.kirupa.com/t/cannot-create-property/325156 "2011-09-28T22:40:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![chopficaro](https://avatars.discourse-cdn.com/v4/letter/c/5f9b8f/32.png) [@chopficaro](https://forum.kirupa.com/u/chopficaro)\
**Post date:** [September 28, 2011, 10:40pm UTC](https://forum.kirupa.com/t/cannot-create-property/325156/1 "2011-09-28T22:40:47Z")

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i made a movie clip in one flash project that compiled fine and worked great  
i copied it over to the library of another project and put a few instances of it on the stage  
when i compile the new project and move to the frame were the instances exist i get the error

ReferenceError: Error #1056: Cannot create property background\_mc on mysqlurl.  
at flash.display::Sprite/constructChildren()  
at flash.display::Sprite()  
at flash.display::MovieClip()  
at mysqlurl()  
at menucaller()  
at flash.display::MovieClip/gotoAndPlay()  
at pat1\_fla::MainTimeline/UGEclickHandler()

background\_mc is part of the movie clip i brought over to the new project  
background\_mc was not generated using actionscript, i put it there in flash and gave it its instance name in the properties panel  
it wasn’t declared as private or public, its just there  
i tried bringing background\_mc over from the other library into the new library, it fixed nothing  
they each are in the same folder and are properly exported for actionscript

whats more is if i copy the movie clip in the new library into an even newer test library , put it on the stage and test it, it works fine!!!

why am i getting this error?