dropwizard fails to start without config.yml

[yawkat]

Exception in thread "main" java.lang.IllegalArgumentException: Unable create an instance of the configuration class: 'at.yawk.javap.JavapConfiguration'
    at io.dropwizard.configuration.ConfigurationFactory.build(ConfigurationFactory.java:134)
    at io.dropwizard.cli.ConfiguredCommand.parseConfiguration(ConfiguredCommand.java:117)
    at io.dropwizard.cli.ConfiguredCommand.run(ConfiguredCommand.java:64)
    at io.dropwizard.cli.Cli.run(Cli.java:70)
    at io.dropwizard.Application.run(Application.java:80)
    at at.yawk.javap.JavapApplicationKt.main(JavapApplication.kt:19)
Caused by: java.lang.InstantiationException: at.yawk.javap.JavapConfiguration
    at java.lang.Class.newInstance(Class.java:427)
    at io.dropwizard.configuration.ConfigurationFactory.build(ConfigurationFactory.java:131)
    ... 5 more
Caused by: java.lang.NoSuchMethodException: at.yawk.javap.JavapConfiguration.<init>()
    at java.lang.Class.getConstructor0(Class.java:3082)
    at java.lang.Class.newInstance(Class.java:412)
    ... 6 more