In the documentation, example code uses ‘opening quotes’ and closeing quoutes’.
Like in a text processor, where they are slightly bended forward or backwards.
In code however these are not allowed.
There you should use normal quoutes, like hexadecimal 22 from the ASCII table.(https://upload.wikimedia.org/wikipedia/commons/1/1b/ASCII-Table-wide.svg)
Now I have to change all the quotes before it compiles.