Thanks for the report. Apparently, the file format in IDEA 13 has changed incompatibly, and Gradle’s ‘idea’ plugin may have to catch up with that. In any case, the preferred way to integrate with IDEA 13 is to import the project using IDEA’s Gradle support, rather than generating project files with ‘gradle idea’. You can still apply the ‘idea’ plugin though and configure it as necessary. Does this solve the problem?