If you have customized your own UI then here is a fix for the error.
1. edit 'eq2ui_mainhud.xml' and add
'eq2ui_mainhud_detrimental_effects.xml ' to the end of the xml. (example below).
2. Save 'eq2ui_mainhud.xml' and restart EQ2
Example:
<include>eq2ui_mainhud_detrimental_effects.xml<include>
</Page>