Item to check
IntelliJ IDEA version 9.0 or later, either Community Edition or Ultimate, must be installed on your computer.
Sources of IntelliJ IDEA Community Edition
The sources of IntelliJ IDEA Community Edition should be checked out to your local computer. This is not a requirement but will make it much easier for you to debug your plugins.
IntelliJ IDEA SDK
Development of your plugins requires the IntelliJ IDEA SDK to be configured for your IDEA project. For more information, see Configuring IntelliJ IDEA SDK below.
Please make sure that the "Plugin DevKit" plugin is enabled in Settings | Plugins.
Configuring IntelliJ IDEA SDK