One or more field types are not installed properly. Go to the list settings page to delete these field" exception.

Thread from: http://social.msdn.microsoft.com/Forums/en-US/sharepointdevelopment/thread/a2c6bed0-eee1-4f9b-b468-fc57c2e45c16


<Where>
<And>
<Eq>...</Eq>
</And>
</Where>

This will throw the "One or more field types are not installed properly. Go to the list settings page to delete these field" exception.

Good code:

<Where>
<And>
<Eq>...</Eq>
<Eq>...</Eq>
</And>
</Where>

or

<Where>
<Eq>...</Eq>
</Where>