我在尝试从SQLite3 DB中选择列时收到此错误，其中列“Username”与变量“username”相同，列“Password”与变量“EncMessage”相同（密码和用户名都是用户通过Tkinter输入框输入的。
当我运行程序并在输入框中输入有效的用户名和密码时，我收到了此错误'行3139，in signin c.execute（（“SELECT Username，Password FROM Customers WHERE Username =？AND Password =？"，用户名，encMessage，））类型错误：参数1必须是字符串，而不是元组“
任何帮助都将不胜感激。

# SignIn Function
def signin():
    username = user.get()
    password = pass.get()
    check_pass = password 
    
    reg = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*#?&])[A-Za-z\d@$!#%*?&]{6,20}$"
    
    # Compiling regex 
    pat = re.compile(reg)

    # Searching regex
    mat = re.search(pat,password)

    # Validation conditions
    if mat and password == check_pass:
        message = password 
        
        key = Fernet.generate_key()
        
        fernet = Fernet(key)

        encMessage = fernet.encrypt(message.encode())
        
        decMessage = fernet.decrypt(encMessage).decode()
        
        if check_pass == decMessage:

            conn = sqlite3.connect('CustomersTTA.db')

            # Create a cursor instance
            c = conn.cursor()

            c.execute("Select rowid, * FROM Customer")
            records = c.fetchall()

            c.execute(("SELECT Username,Password FROM Customers WHERE Username = ? AND Password = ?", username, encMessage,))
         
            if not c.fetchone():
                messagebox.showerror("Invalid","Credentials are incorrect")
            else:
                print("Welcome")