"The macro cannot be found" when clicking on the ribbon

[Paul_Hossler]

How did you add the XML?

It'd be easier if you would attach a small presentation with the macro, etc.

This is my XML. The attachment seems to work, so maybe it's one of your settings??

<customUI xmlns="http://schemas.microsoft.com/office/2009/07/customui">
    <ribbon startFromScratch="false">
        <tabs>
            <tab id="customTab" label="Custom Tab">
                <group id="customGroup" label="Custom Group">
                    <button id="updateProperties" label="updateProperties" imageMso="RecurrenceEdit" size="large" onAction="updatePropertiesCallback" />
                </group>
            </tab>
        </tabs>
    </ribbon>
</customUI>