Python "TypeError: 'bool' object is not callable" Error

I am writing a simple Tic-Tac-Toe game that is a player vs computer game, and I keep getting the "TypeError: 'bool' object is not callable" Error, and I do not understand why I am getting these errors. I have gone through both the formatting and the syntax multiple times and I can't see anything wrong with my code but I keep getting a few errors. Here is my code.

import random


def drawBoard(board):
    #This function prints out the board that it was passed.

    #board" is a list of 10 strings representing the board (ignore index 0).
    print(board[7] + '| ' + board[8] + '| ' + board[9])
    print('-+-+-')
    print(board[4] + '| ' + board[5] + '| ' + board[6])
    print('-+-+-')
    print(board[1] + '| ' + board[2] + '| ' + board[3])

def inputPlayerLetter():
    letter = ''
    while not (letter == 'X' or letter == '0'):
        print('Do you want to be X or O?')
        letter = input().upper()
    if letter == 'X':
        return ['X', '0']
    else:
        return ['0', 'X']

def whoGoesFirst():
    if random.randint(0,1) == 0:
        return ' computer'
    else:
        return ' player'

def makeMove(board, letter, move):
    board[move] = letter

def isWinner(bo, le):
    return ((bo[7] == le and bo[8] == le and bo [9] == le) or 
    (bo[4] == le and bo[5] == le and bo [6] == le)
    (bo[1] == le and bo[2] == le and bo [3] == le)
    (bo[7] == le and bo[4] == le and bo [1] == le)
    (bo[8] == le and bo[5] == le and bo [2] == le)
    (bo[9] == le and bo[6] == le and bo [3] == le)
    (bo[7] == le and bo[5] == le and bo [3] == le)
    (bo[9] == le and bo[5] == le and bo [1] == le))

def getBoardCopy(board):
    boardCopy = []
    for i in board:
        boardCopy.append(i)
    return boardCopy

def isSpaceFree(board, move):
    return board[move] == ' '

def getPlayerMove(board):
    move = ' '
    while move not in '1 2 3 4 5 6 7 8 9'.split() or not isSpaceFree(board, int(move)):
        print('What is your next move? (1-9)')
        move = input()
    return int(move)

def chooseRandomMoveFromList(board, movesList):
    possibleMoves = []
    for i in movesList:
        if isSpaceFree(board, i):
            possibleMoves.append(i)

    if len(possibleMoves) !=0:
        return random.choice(possibleMoves)
    else:
        return None

def getComputerMove(board, computerLetter):
    if computerLetter == 'X':
        playerLetter = '0'
    else:
        playerLetter = 'X'

    for i in range(1, 10):
        boardCopy = getBoardCopy(board)
        if isSpaceFree (boardCopy, i):
            makeMove(boardCopy, computerLetter, i)
            if isWinner(boardCopy, computerLetter):
                return i

    for i in range(1,10):
        boardCopy = getBoardCopy(board)
        if isSpaceFree(boardCopy, i):
            makeMove(boardCopy, playerLetter, i)
            if isWinner(boardCopy, playerLetter):
                return i

    move = chooseRandomMoveFromList (board, [1, 3, 7, 9])
    if move !=None:
        return move

    if isSpaceFree(board, 5):
        return 5

    return chooseRandomMoveFromList(board, [2, 4, 6, 8])

def isBoardFull(board):
    for i in range(1,10):
        if isSpaceFree(board, i):
            return False
        return True


print('Welcome to Tic-Tac-Toe!')

while True:
    theBoard = [' '] * 10
    playerLetter, computerLetter = inputPlayerLetter()
    turn = whoGoesFirst()
    print('The' +turn+ ' will go first.')
    gameIsPlaying = True

    while gameIsPlaying:
        if turn == 'player':
            drawBoard(theBoard)
            move = getPlayerMove(theBoard)
            makeMove(theBoard, playerLetter, move)

            if isWinner(theBoard, playerLetter):
                drawBoard(theBoard)
                print('Horray! You have won the game!')
                gameIsPlaying = False
            else:
                if isBoardFull(theBoard):
                    drawBoard(theBoard)
                    print('The game is a tie!')
                    break
                else:
                    turn = 'computer'

        else:
            move = getComputerMove(theBoard, computerLetter)
            makeMove(theBoard, computerLetter, move)

            if isWinner(theBoard, computerLetter):
                drawBoard(theBoard)
                print('The computer has beaten you! You lose.')
                gameIsPlaying = False
            else:
                if isBoardFull(theBoard):
                    drawBoard(theBoard)
                    print('The game is a tie!')
                    break
                else:
                    turn = 'player'

    print('Do you want to play again? (yes or no)')
    if not input().lower().startswith('y'):
        break