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Uncaught TypeError: Cannot read property 'addEventListener' of undefined

By Blue_kingBlue_king on Jan 27, 2021 
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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Error: TypeError: Cannot read property 'addEventListener' of null at downLoaded (file:///convert.js:10:38)

By Successful StarlingSuccessful Starling on Apr 14, 2021 
if(cInputValue.value != "")

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