I Need Help With Googlebot Been Blocked By Robots.txt

Hi! I am checking my website Mobile Friendly status, and I am getting back some errors. One of them is Googlebot blocked by robots.txt

You can check the results with the following link.

https://search.google.com/test/mobile-friendly/result?id=JZWuCGZXu-V2QrLn-gGJcg

What do I have to do in order to allow Googlebot to check my website properly? I need help with this. My ranking in Google Search can be affected because of this.

Your /robots.txt file doesn't block Googlebot. And you can see that the page was crawled successfully on the results page.
In your results page that you linked to, you can click on one of the issues it found, Text too small to read. Looking at the More Info tab shows some resources unable to load.
Those should probably be looked at by your developer but your page is being crawled correctly by Google.