Code:
Excavator\Excavator_CastBar_Party1.lua:39: attempt to index global 'UIOptionsFrameCheckButtons' (a nil value)
<string>:"*:OnLoad":1: in function <[string "*:OnLoad"]:1>
Excavator\Excavator_CastBar_Party2.lua:39: attempt to index global 'UIOptionsFrameCheckButtons' (a nil value)
<string>:"*:OnLoad":1: in function <[string "*:OnLoad"]:1>
Excavator\Excavator_CastBar_Party3.lua:39: attempt to index global 'UIOptionsFrameCheckButtons' (a nil value)
<string>:"*:OnLoad":1: in function <[string "*:OnLoad"]:1>
Excavator\Excavator_CastBar_Party4.lua:39: attempt to index global 'UIOptionsFrameCheckButtons' (a nil value)
<string>:"*:OnLoad":1: in function <[string "*:OnLoad"]:1>
'Hope you'll be able to fix it ;)