In order for your Sitecore website to work, you need to have a valid license file. License files can only be obtained by spending the money and getting one from Sitecore. I've got this error and it's usually because I'm installing Sitecore from source control on a new PC, or I've moved my Sitecore instances webroot to a new location.
When you install Sitecore through an installer, the license file will usually be copied into a Data folder in your Sitecore instance files. When running the website, if Sitecore can't find this file, then the above error will occur.
<sc.variable name="dataFolder" value="C:\Code\Website\Data\"/>
Software Architect, Programmer and Technologist Jon Jones is founder and CEO of London-based tech firm Digital Prompt. He has been working in the field for nearly a decade, specializing in new technologies and technical solution research in the web business. A passionate blogger by heart , speaker & consultant from England.. always on the hunt for the next challenge