Thanks for your answer Francis.
In am a newie, and did not know how to insert code block, so was playing around.
First I use single line quotes, but changed it afterwards into block quotes because it lookes nicer.
By mistake I forgot to remove some signle line quotes, and correct this now in my original post.
So, with other words, the quote at the end of the line is not used in my configuration.yaml file and was not cause of the failure.