If when you are trying to make a custom MXML component in Flex and you get the error message:
Error: Could not resolve <sness:SimplePlay> to a component implementation.
Make sure you don't have both a SimplePlay.mxml and SimplePlay.as file in your current directory.
My solution is to name the mxml file "SimplePlay.mxml" and the .as file that this file includes named "_SimplePlay.as"
