[CS3-VBA] Why message "request failed..."?

I'm tryin to make global change by font options:

myInd.FindTextPreferences = idNothingEnum.idNothing

myInd.ChangeTextPreferences = idNothingEnum.idNothing
myInd.FindTextPreferences.AppliedFont = "Times New Roman"
myInd.FindTextPreferences.PointSize = 10
myInd.FindTextPreferences.FillColor = myDoc.Swatches.Item("Dark Blue") ' in this line VBA message:

"Reqiest failed because object is from a different document or workspace"

myInd.ChangeTextPreferences.AppliedCharacterStyle = myDoc.CharacterStyles.Item("myStyle")

What does it mean? Which doc? Which workspace?

Thanks for help.