human
Solve the following python programming problem given the following code:
@ inlineCallbacks 
def onJoin(self, details) : 
    print ('session attached') 
    def on_event(val) : 
        print ('Someone requested to square non-positive: {}'.format (val)) 
(yield self.subscribe (on_event, 'com.myapp.square_on_nonpositive')) 
    for val in [2, 0, (- 2)] : 
        res = (yield self.call ('com.myapp.square', res, options = CallOptions ())) 
        print ('Squared {} = {}'.format (val, res)) 
self.leave () 

    
    

    Fix the buggy line: res = (yield self.call ('com.myapp.square', res, options = CallOptions ()))
assistant
#Here is Python program to fix the buggy line: res = (yield self.

res = (yield self.call ('com.myapp.square', val, options = CallOptions ()))