human
Solve the following python programming problem given the following code:
def call_on_each_message(self, callback) : 
    def event_callback(event) : 
        if (event ['type'] == 'message') : 
            callback (event ['message']) 
self.call_on_each_event (callback, ['message']) 

    
    

    Fix the buggy line: self.call_on_each_event (callback, ['message'])
assistant
#Here is Python program to fix the buggy line: self.

self.call_on_each_event (def event_callback(, ['message'])