Here's how to quickly correct the issue behind the server error: version of SharePoint Designer
An easy no-script workaround when using people columns with if/then statements. Allows "is empty," "contains," etc.
How to replace #SharePoint double-arrow (rbunsel.gif or rbsel.gif) icon in connected list view web parts with an icon from FontAwesome.
Make your larger lists easier to use and read by having your headers stick with you while scrolling
Working around the error and editing your master page so that you can revert to previous versions later if needed
Learn to create documents via SharePoint workflow that use a template and are capable of using "merge fields" based on list item data
Learn how to quickly fix unevenly-sized calendar overlay links in your SharePoint calendar views.