Fatal error: Maximum execution time...

I've hit a wall...

I get an error message that seems to appear only when clicking a tag in the left sidebar.
http://iloveto.se/
(Tags = Etiketter in swedish)

I've tried several times, and there are variations:

Fatal error: Maximum execution time of 60 seconds exceeded in /storage/content/06/114306/iloveto.se/public_html/wp-includes/capabilities.php on line 1047

Fatal error: Maximum execution time of 60 seconds exceeded in /storage/content/06/114306/iloveto.se/public_html/wp-includes/cache.php on line 352

Fatal error: Maximum execution time of 60 seconds exceeded in /storage/content/06/114306/iloveto.se/public_html/wp-includes/plugin.php on line 152

What does this mean??