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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)[main]