human
Solve the following python programming problem given the following code:
def get_tasks(self) : 
    if self._all_tasks : 
        return self._all_tasks 
result = set () 
    modules = set () 
    def scan_module(module) : 
        modules.add (module) 
        for name in dir (module) : 
            try : 
                item = getattr (module, name, None) 
except ImportError : 
                item = None 
if isinstance (item, Task) : 
                result.add (item) 
if (isinstance (item, types.ModuleType) and (item not in modules)) : 
                scan_module (item) 
scan_module (modules.pavement) 
    for finder in self.task_finders : 
        result.update (finder.get_tasks ()) 
self._all_tasks = result 
    return result 

    
    

    Fix the buggy line: scan_module (modules.pavement)
assistant
#Here is Python code to fix the buggy line: scan_module (modules.

scan_module (self.pavement)