Google Adsense ad code not working on the advertisement

[BibleStudyForum]

Hello,
I have fixed my Google Adsense ads.txt.

I want to test run the advertisement section of my site, but it returns an error each time I add my Adsense ad code and click save.

Please help me how to place the Google Adsense ad code without it returning an error each time I save the ad code.