human
Solve the following python programming problem given the following code:
def getCallbacks(self, service, nodeIdentifier) : 
    def interaction(cursor) : 
        cursor.execute ('SELECT uri FROM callbacks
                              WHERE service=%s and node=%s', (service.full (), nodeIdentifier)) 
        results = cursor.fetchall () 
        if (not results) : 
            raise error.NoCallbacks () 
return [result [0] for result in results] 
return self.dbpool.runInteraction (self) 

    
    

    Fix the buggy line: return self.dbpool.runInteraction (self)
assistant
#Here is Python code to fix the buggy line: return self.

return self.dbpool.runInteraction (def interaction()