Login error

[Aron Zeus]

Hi 
I have problem on login.
to login usi Python API, I was writing as this 

mt5.initialize()
authorized = mt5.login(12345600)

if authorized:
        print("Success: Connecting to MT5 Client")
    else:
        print("Failed to connect at account #{}, error code: {}".format(account_ID, mt5.last_error()))

As written at Metatrader5 reference.
There was no problem for a while, but suddenly  

I got this error message.

Failed to connect at account #12345600, error code: (-2, 'Terminal: Invalid params')

does anyone have knowledge about why this happen?