Uncaught TypeError: Cannot read properties of null (reading ‘addEventListener’)
In JavaScript, a very common error is the Uncaught TypeError: Cannot read properties of null (reading ‘addEventListener’). This error occurs when JavaScript cannot find the element by using its id through the getElementById() function. Another case of this error is you no HTML element id exists which you are trying to get using document.getElementById.
So you need to add your code in ready function like below:-
$(document).ready(function(){
document.getElementById("inp2").addEventListener("change", readFile2);
})
or you have to check the element id its exists or not.
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