Sheet Change Event wont work

Hi guys, me again.

I have a Combo Box on a Work Sheet that the user selects a subject from.

When the Combo Box content changes I need it to run a macro.

Ive tried putting this in the WorkSheet file for the sheet

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But no joy. Is there something I'm missing or not doing correctly because its a drop down list?

The macro works fine its just not executing.

Any help much appreciated

Thanks

What do you mean by pickbox?