/Html/Uncaught TypeError: Cannot read property 'value' of null at HTMLButtonElement.<anonymous>

Uncaught TypeError: Cannot read property 'value' of null at HTMLButtonElement.<anonymous>

Uncaught TypeError: Cannot read property 'value' of null at HTMLButtonElement.

      <input id="addTodoTextInput "type="text"> <!-- wrong : NO SPACE in ID property -->
 	  <input id="addTodoTextInput" type="text"> <!-- correct -->

Source: teamtreehouse.com

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