Gradle Start not found when running sub-modules

My project structure is as follows.

/version-name/build.gradle (whatever version)

This is a forge-gradle project, and inside the src of the first project, there are just the resources. In core is a library which the version embeds like embed project(":core"). When I run said version-name, with ./gradlew getIntellijRuns and then run the generated configuration, it claims that Gradle Start can’t be found.

This might not be the proper way to go about doing this, so what am I doing wrong, and how can I fix it?