how can i fix this error please

freekilluminati — Wed, 16 Aug 2017 17:40:42 GMT

macroScript FP_MS_SelectCustomObject
   ButtonText:"Select Forest Custom Object"
   category:"Forest Pack"
   (
   global FP_SelectorItems
   global FP_SelectorNames
   on IsVisible return (isForestPack $)
   on Execute do
       (
       FP_SelectorItems = #()
       FP_SelectorNames = #()
       for i = 1 to $.cobjlist.count do
           (
           if $.cobjlist[i] != undefined then
               (
               append FP_SelectorItems $.cobjlist[i]
               append FP_SelectorNames $.namelist[i]
               )
           )
       FP_ShowMenuSelector()
       )
   )

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how can i fix this error please