If you are getting an Error Message for using adblocker which you are not using or have disabled it , let me help you and how i fixed this issue for my self
So recently me and my friend who i gave access to my server were getting a problem with adblock popup which we have ad blocker but disabled for this site , so i tried to find a fix , also saw the article for adblock help , did not help at all, Today i found a fix for what was going on with us
We were using a vpn extension (off while on aternos.org) , so i saw somewhere where it said that use vpn to fix this issue , so i turned vpn and i see that there are option for blocking ads and scripts , i enabled the vpn and disabled it , after that i did not got the error for once , so if you are using a vpn extension then try turning it on or off , now if you dont use a vpn extension then try installing one and doing this , might fix this issue for you
i know this might and might only fix your problem but thats how i fixed this issue for my self i hope this helps you
*Note , this issue was still occurring for my friend after he did this method , it worked for him but after sometime when he re open the aternos page he got it again , he fixed it by doing it the same way but still gets this error without doing this method