Android : Android Studio - Application won't start with foreign keys

I'm trying to make my first android application. As such, I'm trying to create a test database which includes foreign keys. However, whenever I try to use foreign keys, the program crashes with the following error:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.johan.androidtestdb/com.example.johan.androidtestdb.MainActivity}: android.database.sqlite.SQLiteException: near "_scheduleGenID": syntax error (code 1): , while compiling: CREATE TABLE task(_taskID INTEGER PRIMARY KEY AUTOINCREMENT, taskName TEXT NOT NULL, taskDesc TEXT NOT NULL, time INTEGER NOT NULL _scheduleGenID INTEGER, FOREIGN KEY (_scheduleGenID) REFERENCES scheduleGen (_scheduleGenID));

I've read the SQLite foreign key document and other answers on this site, but I still can't seem to figure out my problem. If I remove all the traces of the foreign keys, the application starts without any problems.

Here's my code:

public class MyDBHandler extends SQLiteOpenHelper {
    public static final String TAG = "MyDBHelper";

public static final String TABLE_TASK = "task";
public static final String SCHE_scheduleGenID = "_scheduleGenID";
public static final String taskID = "_taskID";
public static final String taskName = "taskName";
public static final String taskDesc = "taskDesc";
public static final String taskTime = "time";

//Columns in the ScheduleGen table
public static final String TABLE_SCHEDULE_GEN = "scheduleGen";
public static final String scheduleGenID = "_scheduleGenID";
public static final String studyHours = "studyHours";
public static final String generateSchedule = "generateSchedule";
public static final String excludeMon = "excludeMon";
public static final String excludeTues = "excludeTues";
public static final String excludeWed = "excludeWed";
public static final String excludeThur = "excludeThur";
public static final String excludeFri = "excludeFri";
public static final String excludeSat = "excludeSat";
public static final String excludeSun = "excludeSun";

//Columns in the TaskSub table
public static final String TABLE_TASKSUB = "taskSub";
public static final String taskSubID = "_taskSubID";
public static final String TASKSUB_TASKID = "_taskID";
public static final String weekday = "weekday";
public static final String taskSubName = "taskSubName";
public static final String taskSubTime = "taskSubTime";
public static final String remainingTime = "remainingTime";

private static final String DATABASE_NAME = "studentapp.db";
private static final int DATABASE_VERSION = 2;

// SQL kommandon för skapandet av tabellen
private static final String SQL_CREATE_TABLE_TASK = "CREATE TABLE " + TABLE_TASK + "("
        + taskID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
        + taskName + " TEXT NOT NULL, "
        + taskDesc + " TEXT NOT NULL, "
        + taskTime + " INTEGER NOT NULL "
        + SCHE_scheduleGenID + " INTEGER,"
        + " FOREIGN KEY ("+SCHE_scheduleGenID+") REFERENCES "+TABLE_SCHEDULE_GEN+" ("+scheduleGenID+"));";

private static final String SQL_CREATE_TABLE_SCHEDULE_GEN = "CREATE TABLE " + TABLE_SCHEDULE_GEN + "("
        + scheduleGenID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
        + studyHours + " INTEGER NOT NULL, "
        + generateSchedule + " INTEGER NOT NULL, "
        + excludeMon + " INTEGER NOT NULL, "
        + excludeTues + " INTEGER NOT NULL, "
        + excludeWed + " INTEGER NOT NULL, "
        + excludeThur + " INTEGER NOT NULL, "
        + excludeFri + " INTEGER NOT NULL, "
        + excludeSat + " INTEGER NOT NULL, "
        + excludeSun + " INTEGER NOT NULL "
        +");";

private static final String SQL_CREATE_TABLE_TASKSUB = "CREATE TABLE " + TABLE_TASKSUB + "("
        + taskSubID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
        + weekday + " INTEGER NOT NULL, "
        + taskSubName + " TEXT NOT NULL, "
        + taskSubTime + " TEXT NOT NULL, "
        + remainingTime + " TEXT NOT NULL "
        + TASKSUB_TASKID + " INTEGER,"
        + " FOREIGN KEY ("+TASKSUB_TASKID+") REFERENCES "+TABLE_TASK+" ("+taskID+"));";

public MyDBHandler(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
    super(context, DATABASE_NAME, factory, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase database) {
    database.execSQL(SQL_CREATE_TABLE_TASK);
    database.execSQL(SQL_CREATE_TABLE_SCHEDULE_GEN);
    database.execSQL(SQL_CREATE_TABLE_TASKSUB);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    Log.w(TAG,
            "Upgrading the database from version " + oldVersion + " to " + newVersion);
    // clear all data
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_TASK);
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_SCHEDULE_GEN);
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_TASKSUB);

    // recreate the tables
    onCreate(db);
}

public void addTask(Task task){
    ContentValues values = new ContentValues();
    values.put(taskName, task.getMtaskName());
    values.put(taskDesc, task.getMtaskDesc());
    values.put(taskTime, task.getmTime());
    SQLiteDatabase db = getWritableDatabase();
    db.insert(TABLE_TASK, null, values);
    db.close();
}

public String databaseToString(){
    String dbString = "";
    SQLiteDatabase db = getWritableDatabase();
    String query = "SELECT * FROM " + TABLE_TASK + " WHERE 1";

    //Cursor points to a location in your results
    Cursor c = db.rawQuery(query, null);
    //Move to the first row in your results
    c.moveToFirst();

    //Position after the last row means the end of the results
    while (!c.isAfterLast()) {
        if (c.getString(c.getColumnIndex("")) != null) {
            dbString += c.getString(c.getColumnIndex("taskName"));
            dbString += "\n";
        }
        c.moveToNext();
    }
    db.close();
    return dbString;
}