ios - Ambiguous use of subscript swift 2.2 -

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i error right before ["toposition"] saying ambiguous use of subscript

guard let toloc = self.currentdetailobj!["toposition"][0] as? pfgeopoint else {             return }

in previous statement works fine 

    guard let fromloc = self.currentdetailobj!["fromposition"] as? pfgeopoint else{         return     }

why first statement not work? need position @ index 0.

use .first

guard let toloc = self.currentdetailobj?["toposition"].first as? pfgeopoint else {             return }

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