NetworkErrorEvent
public class NetworkErrorEvent : NSObject, EventProtocolFired when NetworkEventTypes.ERROR occurs for the THEOplayer.
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                  The textual representation of the type of event, ‘networkerror’. DeclarationSwift public let type: String
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                  The date at which the event occurred. DeclarationSwift public let date: Date
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                  A NetworkErrorinstance containing information about the error.DeclarationSwift public let error: NetworkError?
