Flush the rewrite rules by going to Settings > Permalinks and clicking on "Save Changes." This will regenerate the rewrite rules and may resolve the issue.
RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^index.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /index.php [L] Topic Links 2.2 Archive Fix
Regenerate the archive pages by going to the Topic Links 2.2 settings and clicking on "Regenerate Archive Pages." Flush the rewrite rules by going to Settings
The first step is to ensure that the Topic Links 2.2 plugin is up to date. Check the plugin repository for any updates and install the latest version. Topic Links 2.2 Archive Fix