An unhandled exception occurred in the user interface.Exception Information: OSearch (SPSearchAcct)

Setting up SharePoint? Accounts need their domain.
I have been meaning to post this forever and keep forgetting. A very common issue I am seeing people have when setting up and configuring SharePoint is the way they are specifying account names. You must always specify domain\username. Even though SharePoint will never tell you this is the problem it is. Many users are tempted to just type in username for a service and then the password then they are greeted with a random/cryptic error message. After about an hour (or a day of reinstalling) they realize it was because they forgot to specify the domain name.

I will attempt to compile a list of error messages that have been caused by this issue and post them here. If you have one please post it in the comments and I will update the post. Thanks

Sample Error:

An unhandled exception occurred in the user interface.Exception Information: OSearch (SPSearchAcct)