This error message usually appears on Kemono.su (or the older .party domain) when you try to perform an action that requires a user account, or if your browser’s session has timed out.
Here is how to fix it based on what you are trying to do:
1. If you are just trying to browse/view posts
You do not need to be logged in to view content. If you are seeing this error while simply clicking on a post or an artist, it is a site glitch.
Fix: Clear your browser cache and cookies for the site.
Chrome: Settings > Privacy and security > Delete browsing data > Select “Cookies and other site data” > Clear data.
Edge/Firefox: Similar steps in History/Privacy settings.
Alternative: Try opening the link in an Incognito/Private window. If it works there, the issue is definitely your cookies.
2. If you are trying to “Favorite” or “Bookmark” an artist
You likely clicked the “Add to Favorites” (heart icon) button. This feature requires a registered account on the site to save your list.
Fix: You must register for a free account on Kemono to use this feature. Look for the Register or Log In link in the top right corner.
Note: Registration is sometimes closed or buggy. If you cannot register, you cannot use the Favorites feature.
Also Read : BOB Server Down Today
3. If you are using an AdBlocker
Some ad blockers or privacy extensions (like uBlock Origin) can accidentally block the scripts Kemono uses to manage sessions, triggering this error even if you aren’t doing anything special.
Fix: Temporarily disable your ad blocker for the site and refresh the page to see if the error disappears.
4. If you are using an “Importer” tool
If you are trying to upload or import cookies to update an artist’s gallery, this error means your imported session cookie (from Patreon/Fanbox/etc.) is invalid, expired, or the site is blocking the import request.
Fix: You will need to extract a fresh session cookie from the original site (e.g., Patreon) and re-enter it into the importer.
Summary:
If you are just a casual viewer, clearing your cookies usually fixes this immediately.
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