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

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java.lang.NullPointerException:
at io.swagger.codegen.DefaultGenerator.generateParameterId(DefaultGenerator.java:832)
at io.swagger.codegen.DefaultGenerator.processOperation(DefaultGenerator.java:756)
at io.swagger.codegen.DefaultGenerator.processPaths(DefaultGenerator.java:725)
at io.swagger.codegen.DefaultGenerator.generateApis(DefaultGenerator.java:354)
at io.swagger.codegen.DefaultGenerator.generate(DefaultGenerator.java:664)
at io.swagger.codegen.cmd.Generate.run(Generate.java:234)
at io.swagger.codegen.SwaggerCodegen.main(SwaggerCodegen.java:41)

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