If you get this error, and haven’t touched a page layout, don’t worry: This page is not using a valid page layout. To correct the problem, edit page settings and select a valid page layout. I panicked at first thinking about how I might have destroyed my development environment, but it turned out to be something very simple. During a quick prototype, I used a querystring parameter of “ID” in a web part.

Outbound smtp email can be set at the farm level (Central Admin –> System Settings –> Configure outgoing e-mail settings) OR at the Web Application Level (Central Admin –> Application Management –> Manage Web Applications –> [select your web app] –> click the General Settings dropdown and select “Outgoing E-mail” Handy to know when you glance at the farm-level settings, and notice you don’t have an outgoing server setup, yet emails are still being sent!

If you get an error in the log that looks like this: Exception thrown storing stream in new SqlRemoteBlob: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> Microsoft.Data.SqlRemoteBlobs.BlobStoreException: There was a generic database error. For more information, see the included exception. ---> System.Data.SqlClient.SqlException: Invalid format specification: '%hs does not exist.)' while attempting 'NtCreateFile' on 'D:\\SQLRBSWSS\_Content13bc3f57-1564-4b1d-98db-dc6008bd7d2366c4d9d9-94d2-4e91-9495-4ac5d4898801000031a-000018f4-0012 Check to make sure the destination folders exist. Mine did not.