Error looping through unread messages

[itsnotms]

def mails():

    log("Opening browser window please Log into the account:", "yellow")
    time.sleep(2)

    #Open GMAIL to verify the login
    gmail = Gmail()
    gmail.maxResults = 100 


    log("AUTH DONE!", "success")
    messages = gmail.get_unread_inbox()

    for message in messages:
        
        if message.subject == "XY":
            log("Found an email to verify")
            print(message.html)
         


mails()

Results in the following errors :

AttributeError: module 'collections' has no attribute 'Callable'
TypeError: can only concatenate list (not "NoneType") to list

I am using Python 3.10.7