human
Solve the following python programming problem given the following code:
def execute(self) : 
    with self.invalidated (self.context.targets (is_jvm_library)) as invalidation_check : 
        with self.context.new_workunit (name = 'jar-create', labels = [WorkUnitLabel.MULTITOOL]) : 
            jar_mapping = self.context.products.get ('jars') 
            for vt in jarfile.all_vts : 
                jar_name = (vt.target.name + '.jar') 
                jar_path = os.path.join (vt.results_dir, jar_name) 
                def add_jar_to_products() : 
                    jar_mapping.add (vt.target, vt.results_dir).append (jar_name) 
if vt.valid : 
                    if os.path.exists (jar_path) : 
                        add_jar_to_products () 
else : 
                    with self.create_jar (vt.target, jar_path) as jarfile : 
                        with self.create_jar_builder (jarfile) as jar_builder : 
                            if jar_builder.add_target (vt.target) : 
                                add_jar_to_products () 

    
    

    Fix the buggy line: for vt in jarfile.all_vts :
assistant
#Here is Python code to fix the buggy line: for vt in jarfile.

for vt in invalidation_check.all_vts :