Uncaught TypeError: undefined is not a function in javascript -

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HTML: 

  & lt; body & gt; & Lt; div id = "मुख्य" & gt; & Lt; span id = "msg" & gt; क्या आप वाकई आगे बढ़ना चाहते हैं? & Lt; / span & gt; & lt; br & gt; & lt; br & gt; & Lt; इनपुट प्रकार = बटन आईडी = "हां" मान = "हाँ" & gt; & Lt; इनपुट प्रकार = बटन आईडी = "नहीं" मान = "नहीं" & gt; & Lt; / div & gt; & Lt; / body & gt;   
 जावास्क्रिप्ट:  
  फ़ंक्शन doTask () {...} function doNothing () {...} var do = function () {doTask ( );} Var nothing = function () {doNothing ();} document.getELementById ("हां")। AddEventListener ("क्लिक करें", करें); । Document.getElementById ( "नहीं") addEventListener ( "क्लिक", कुछ भी नहीं);   
 जब मैं दस्तावेज़ चलाता हूं, तो कंसोल अनक्यूट टाइपएरर को दिखाता है: अनिर्धारित दस्तावेज़.getElementById ("हां") ... फ़ंक्शन त्रुटि पर नहीं है।   
 
 
 ऐसा क्यों नहीं?  
 
 । document.getElementById ( "हाँ") addEventListener ( "क्लिक", doTask ()); Document.getElementById ("नहीं")। AddEventListener ("क्लिक करें", doNothing ());

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