ZOs said they will fix the error next incremental patch (maybe). So you need to wait for this or ask the authors to implement a fix within the addons then.
Edit:
If an addon is not working and shows a ZO_Skill.... error including this line with addoncompatibility then
download the adddon "Medic UI fixes" AND edit the txt file of the addon not working and add/change if it already exists the line here:
If the line already exists then just add Medic at the ende like this
Code:
##DependsOn: Addon1 Addon2 Medic
Reloadui
This assures that Medic gets loaded BEFORE this addon and should fix the function code