Python threading argument missing

Question

I am getting a missing argument error and I am following the answer here. Python: TypeError in Threading. function takes x positional argument but y were given What am I missing? Help a newbie.
From answer "each character is being passed as a separate argument to startSuggestworker.

Instead, you should provide args a tuple: t = threading.Thread(target=startSuggestworker, args = (start_keyword,)) "

    self.thread = threading.Thread(target=self.threadManager(), args=(fl,))
TypeError: threadManager() missing 1 required positional argument: 'fl'

Here is the signature for threadManager()

def threadManager(self, fl):
       #code 

Edit Add more context: Some how this code works for me

self.thread2 = threading.Thread(target=self.startProcess2, args=(fl,myData))

And the definition for startProcess2

def startProcess2(self, fnfull, myData):
     #code 

But this fails for me

        if fl != '':
            self.threadx = threading.Thread(target=self.threadManager(), args=(self,fl,))
            self.threadx.start()