Whenever I have a calendar web part on any page.

If I click the week view button I get the following non-user
friendly error.

"
Error

An unexpected error has occurred.

Web Parts Maintenance Page: If you have permission, you can use this
page to temporarily close Web Parts or remove personal settings. For
more information, contact your site administrator.
Troubleshoot issues with Windows SharePoint Services. "

It works for Month View, and Day View, but always hickups on the
Week view.

Week view is an extremly userful view, and I need to be able to use
it.

Any suggestions on what this could be or how to fix this issue?