I'm having a helluva time trying to publish a multiplatform library to bintray. The problem I'm stuck on is this error when syncing gradle;

Could not get unknown property 'java' for SoftwareComponentInternal set of type org.gradle.api.internal.component.DefaultSoftwareComponentContainer.

This is my build.gradle: https://pastebin.com/vxanr3UU I have found people doing it in many other ways, but I haven't found a solution that works from start to finish. How do I work around this error?