identifier has already been declared javascript

// This problem can occur for many reasons 
// It cannot be resolved without seeing code because it can happen for 
// different reasons

But it is worth having a look at

	1.If you are doing code in console then keep in mind that:
    	`let` and `const` variables, by design, can't be redeclared. 
		When you write console code, you're writing it all in 
		the same scope, even if you hit enter and write more 
		code again. Because of this, you're re-declaring them,
		breaking this rule, and causing an error.

Things you can do:
	1. use `var`. Not always convenient, especially if copy-pasting code
	reload the page/console. Similarly, not always convenient if you want to 
    maintain whatever state your page currently has

	2. rename your variables. Depending on how many variables you have, 
      can be annoying, especially for copy-paste code.

	3. remove `let` after the first run, simply re-defining 
	the value instead of re-declaring the variable. 
    If you're re-using the same code again and again, 
	this at least becomes a change you only need to make once.

	4. wrap your code in a block {...}. Less inconvenient, 
      but works since `let` and `const` are block scoped and 
      they won't be creating declarations in the global scope 
      that can't be overritten by similarly named declarations. 
      The problem with this is that you won't be able to access your 
      variables if you try to enter a new console command since they 
      don't exist in that scope.