Uncaught TypeError: Cannot read property 'addEventListener' of undefined

Anna Belogubets

1)Check you placed .before the class
Example:
document.getElementsByClassName('.yourclassname') //.before class name is wrong
the code should be document.getElementsByClassName('yourclassname');
2)Check the spelling for addEventListener 
///dont feel embrassed because i always do these mistakes eventhough i used this property it 10000 times

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