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

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java.lang.NullPointerException:
at io.swagger.models.properties.RefProperty.get$ref(RefProperty.java:52)
at io.swagger.codegen.DefaultCodegen.getSwaggerType(DefaultCodegen.java:1062)
at io.swagger.codegen.languages.ScalaClientCodegen.getSwaggerType(ScalaClientCodegen.java:188)
at io.swagger.codegen.DefaultCodegen.fromProperty(DefaultCodegen.java:1365)
at io.swagger.codegen.DefaultCodegen.fromParameter(DefaultCodegen.java:2195)
at io.swagger.codegen.DefaultCodegen.fromOperation(DefaultCodegen.java:1961)
at io.swagger.codegen.DefaultGenerator.processOperation(DefaultGenerator.java:744)
at io.swagger.codegen.DefaultGenerator.processPaths(DefaultGenerator.java:688)
at io.swagger.codegen.DefaultGenerator.generate(DefaultGenerator.java:376)
at io.swagger.codegen.cmd.Generate.run(Generate.java:223)
at io.swagger.codegen.SwaggerCodegen.main(SwaggerCodegen.java:36)

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