issue on IAB TC string and eu user consent problem

Hello there , For the last 5 days an error is showing on my adsense. the error is like

“We’ve detected an issue on your IAB TC string on one or more of your sites or apps”

Adsense also added this link for help but i cant understand any thing here
https://support.google.com/adsense/answer/9999955

Problem that are showing in error file no. 2.1a , 1.1 , 5.1 .

please help me what to do.

• This topic was modified 4 years, 7 months ago by Prasanta Ghosh.
• This topic was modified 4 years, 7 months ago by Prasanta Ghosh.

The page I need help with: [log in to see the link]