# ComboBox Linkage Identifier Error . Help

**URL:** <https://forum.kirupa.com/t/combobox-linkage-identifier-error-help/277130>\
**Category:** flash\
**Created:** [December 8, 2008, 9:24am UTC](https://forum.kirupa.com/t/combobox-linkage-identifier-error-help/277130 "2008-12-08T09:24:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ayumilove](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/ayumilove/32/2532_2.png) [@ayumilove](https://forum.kirupa.com/u/ayumilove)\
**Post date:** [December 8, 2008, 9:24am UTC](https://forum.kirupa.com/t/combobox-linkage-identifier-error-help/277130/1 "2008-12-08T09:24:36Z")

</div>

**Warning** The linkage identifier ‘ComboBox’ was already assigned to the symbol ‘ComboBox’, and cannot be assigned to the symbol ‘GUI MC/Combo Boxes/abc’, since linkage identifiers must be unique.  
**Warning** The linkage identifier ‘ComboBox’ was already assigned to the symbol ‘ComboBox’, and cannot be assigned to the symbol ‘GUI MC/Combo Boxes/def’, since linkage identifiers must be unique.

Both of my ComboBoxes has the same identifier.  
I could not change the identifier through the properties tab because it is greyed out.  
How do I solve this?