Upgrade to the [url=http://www.mediamonkey.com/forum/viewtopic.php?f=6&t=34632]latest scrobbler plugin[/url] and the latest [url=http://www.mediamonkey.com/download/]MediaMonkey 3.1[/url] release. Does that resolve the issue?

Oops, thought it was in my sig. Now it is.
Scrobbler has version 1.0.2.12

Which version of MediaMonkey (Help > About) and the Last.fm scrobbler (Tools > Options > General plug-ins) are you using?

This is the error message.
[url=http://img269.imageshack.us/i/exceptione.jpg/][img]http://img269.imageshack.us/img269/5189/exceptione.th.jpg[/img][/url]

Nothing bad happens after the message appears and i clicked ok, but it gets annoying.