Help in generating critical css

So I use above the fold to extract the full css of my home page and I paste it over at https://jonassebastianohlsson.com/criticalpathcssgenerator/ but I keep getting errors telling me to check my css or url yet I’m pretty sure both are correct.

Anyone willing to help me out? My site is http://chantalle.biz

Thanks in advance!

https://wordpress.org/plugins/above-the-fold-optimization/