Basic JavaScript - Concatenating Strings with the Plus Equals Operator

It does not read my code as correct, but there is no mistake.

This is my code so far:
let myStr = "This is the first line sentence. ";

myStr += “This is the second sentence.”;


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**Challenge:**  Basic JavaScript - Concatenating Strings with the Plus Equals Operator

**Link to the challenge:**
https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript/concatenating-strings-with-the-plus-equals-operator

There is a mistake in the string. You have an extra word that should not be there.