TypeError: Class extends value undefined is not a constructor or null

public constructor(context: CommandContext, options: Command.Options) {
                super(context, {
                        description: 'Play a song',
                        preconditions: [ new VoiceChannelOnly() ],
                        options: [
                                {
                                        name: 'play',
                                        description: 'Play a song from YouTube',
                                        type: 'STRING',
                                        required: true
                                }
                        ]
                });
        }

public constructor(context: CommandContext, options: Command.Options) {
                super(context, {
                        description: 'Play a song',
                        preconditions: [ new VoiceChannelOnly() ],
                        options: [
                                {
                                        name: 'play',
                                        description: 'Play a song from YouTube',
                                        type: 'STRING',
                                        required: true
                                }
                        ]
                });
        }