import mongoose schema into another schema file makes the imported schema undefined

So I have 4 schema's and I want to use the other schema's in the all my schema's but when I import it I get an error:

C:\Users\phara0h\Dropbox\esports-scores.com\nodeTest\node_modules\mongoose\lib\schema.js:425
      throw new TypeError('Invalid value for schema Array path `' + prefix + key + '`');
      ^

TypeError: Invalid value for schema Array path `matches`
at Schema.add (C:\Users\phara0h\Dropbox\esports-scores.com\nodeTest\node_modules\mongoose\lib\schema.js:425:13)
at new Schema (C:\Users\phara0h\Dropbox\esports-scores.com\nodeTest\node_modules\mongoose\lib\schema.js:99:10)
at Object.<anonymous> (C:/Users/phara0h/Dropbox/esports-scores.com/nodeTest/src/schemas/tournamentsSchema.js:8:34)
at Module._compile (module.js:570:32)
at loader (C:\Users\phara0h\Dropbox\esports-scores.com\nodeTest\node_modules\babel-register\lib\node.js:144:5)
at Object.require.extensions.(anonymous function) [as .js] (C:\Users\phara0h\Dropbox\esports-scores.com\nodeTest\node_modules\babel-register\lib\node.js:154:7)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
at Object.<anonymous> (C:/Users/phara0h/Dropbox/esports-scores.com/nodeTest/src/schemas/teamsSchema.js:5:1)
at Module._compile (module.js:570:32)
at loader (C:\Users\phara0h\Dropbox\esports-scores.com\nodeTest\node_modules\babel-register\lib\node.js:144:5)
at Object.require.extensions.(anonymous function) [as .js] (C:\Users\phara0h\Dropbox\esports-scores.com\nodeTest\node_modules\babel-register\lib\node.js:154:7)
at Module.load (module.js:487:32)

When I console.log the imported variable they are undefined.

playersSchema.js:

import mongoose, { Schema } from 'mongoose';
import timestamps from 'mongoose-timestamp';
import { MatchesSchema } from './matchesSchema';
import { TeamsSchema } from './teamsSchema';
import { TournamentsSchema } from './tournamentsSchema';

// Mongoose Schema definition
export const PlayersSchema = new Schema({
    active: Boolean,
    captain: {type: Boolean, default: false},
    activeTeam: String,
    birthDate: Date,
    country: String,
    firstName: String,
    lastName: String,
    nickName: String,
    matches: [MatchesSchema],
    picture: String,
    position: String,
    steamId: String,
    twitch: String,
    teams: [TeamsSchema],
    tournaments: [TournamentsSchema]
});
PlayersSchema.plugin(timestamps);
PlayersSchema.index({ activeTeam: 'text', country: 'text', firstName:     'text', lastName: 'text', nickName: 'text' });
export const PlayerDB = mongoose.model( 'Players', PlayersSchema );

matchesSchema.js:

import mongoose, { Schema } from 'mongoose';
import timestamps from 'mongoose-timestamp';
import { PlayersSchema } from './playersSchema';
import { TeamsSchema } from './teamsSchema';
import { TournamentsSchema } from './tournamentsSchema';

// Mongoose Schema definition
    const MatchesSchema = new Schema({
    dateUTC: String,
    ended: Boolean,
    lenght: String,
    matchDetails: Schema.Types.Mixed,
    matchId: Number,
    player: [PlayersSchema],
    teams: [TeamsSchema],
    tournament: {type: String, ref: TournamentsSchema },
    winner: String
});
MatchesSchema.plugin(timestamps);

console.log('MatchesSchema ', MatchesSchema)


export const MatchesDB = mongoose.model( 'Matches', MatchesSchema );

export default MatchesSchema;

teamsSchema.js

import mongoose, { Schema } from 'mongoose';
import timestamps from 'mongoose-timestamp';
import { PlayersSchema } from './playersSchema';
import { MatchesSchema } from './matchesSchema';
import { TournamentsSchema } from './tournamentsSchema';

// Mongoose Schema definition
export const TeamsSchema = new Schema({
    country: String,
    teamTag: String,
    logo: String,
    matches: [MatchesSchema],
    name: String,
    players: [PlayersSchema],
    steamId: String,
    url: String,
    tournaments: [TournamentsSchema]
});
TeamsSchema.plugin(timestamps);
TeamsSchema.index({ teamTag: 'text', country: 'text', name: 'text' });
export const TeamsDB = mongoose.model( 'Teams', TeamsSchema );

tournamentSchema.js

import mongoose, { Schema } from 'mongoose';
import timestamps from 'mongoose-timestamp';
import { PlayersSchema } from './playersSchema';
import { MatchesSchema } from './matchesSchema';
import { TeamsSchema } from './teamsSchema';

// Mongoose Schema definition
export const TournamentsSchema = new Schema({
    description: String,
    endDate: String,
    itemdef: Number,
    leagueid: Number,
    matches: [MatchesSchema],
    name: String,
    organizer: String,
    production: String,
    prizepool: String,
    players: [PlayersSchema],
    results: String,
    startDate: String,
    teams: [TeamsSchema],
    tournamentUrl: String
});
TournamentsSchema.plugin(timestamps);
TournamentsSchema.index({ description: 'text', name: 'text', organizer : 'text' });
export const TournamentsDB = mongoose.model( 'Tournaments', TournamentsSchema );

Thanx in advanced

via Phara0h