java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at io.swagger.models.refs.GenericRef.computeRefFormat(GenericRef.java:93)
at io.swagger.models.refs.GenericRef.(GenericRef.java:14)
at io.swagger.models.properties.RefProperty.set$ref(RefProperty.java:56)
at io.swagger.models.properties.RefProperty.(RefProperty.java:18)
at io.swagger.jackson.ModelResolver.resolveProperty(ModelResolver.java:109)
at io.swagger.jackson.ModelResolver.resolveProperty(ModelResolver.java:71)
at io.swagger.converter.ModelConverterContextImpl.resolveProperty(ModelConverterContextImpl.java:79)
at io.swagger.jackson.ModelResolver.resolveProperty(ModelResolver.java:87)
at io.swagger.jackson.ModelResolver.resolveProperty(ModelResolver.java:71)
at io.swagger.converter.ModelConverterContextImpl.resolveProperty(ModelConverterContextImpl.java:79)
at io.swagger.jackson.ModelResolver.resolve(ModelResolver.java:342)
at io.swagger.jackson.ModelResolver.resolve(ModelResolver.java:127)
at io.swagger.converter.ModelConverterContextImpl.resolve(ModelConverterContextImpl.java:99)
at io.swagger.jackson.ModelResolver.resolveProperty(ModelResolver.java:106)
at io.swagger.jackson.ModelResolver.resolveProperty(ModelResolver.java:71)
at io.swagger.converter.ModelConverterContextImpl.resolveProperty(ModelConverterContextImpl.java:79)
at io.swagger.converter.ModelConverters.readAsProperty(ModelConverters.java:58)
at io.swagger.jaxrs.Reader.parseMethod(Reader.java:784)
at io.swagger.jaxrs.Reader.read(Reader.java:293)
at io.swagger.jaxrs.Reader.read(Reader.java:145)
at io.swagger.jaxrs.config.BeanConfig.scanAndRead(BeanConfig.java:223)
at io.swagger.jaxrs.config.BeanConfig.setScan(BeanConfig.java:204)
at org.mitre.lstte.startdata.App.run(App.java:70)
at org.mitre.lstte.startdata.App.run(App.java:1)
at io.dropwizard.cli.EnvironmentCommand.run(EnvironmentCommand.java:42)
at io.dropwizard.cli.ConfiguredCommand.run(ConfiguredCommand.java:76)
at io.dropwizard.cli.Cli.run(Cli.java:70)
at io.dropwizard.Application.run(Application.java:73)

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