I believe the problem may be that you have latest development version of plugin installed and you probably have “latest development build” channel configured as described [here] (GitHub - JetBrains/kotlin: The Kotlin Programming Language.). You can check this via Plugins | Browse repositories | Manage repositories. Repository for 1.0.3 EAP is https://plugins.jetbrains.com/plugins/eap/6954 .
If that’s the case and you want to use 1.0.3 EAP build, you can uninstall current plugin (have to restart IDE) and then follow the steps. If you have both channels configured you can go to Plugins | Browse repositories and choose eap repository only, find Kotlin plugin (should be v.1.0.3-eap-30-smth) and install it.