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

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java.lang.NullPointerException:
at java.io.Reader.(Unknown Source)
at java.io.InputStreamReader.(Unknown Source)
at org.raml.parser.utils.StreamUtils.reader(StreamUtils.java:37)
at org.raml.parser.visitor.YamlValidationService.validate(YamlValidationService.java:82)
at org.raml.parser.visitor.YamlValidationService.validate(YamlValidationService.java:72)
at com.company.ramlvalidator.Generator.parseArgs(Generator.java:50)
at com.company.ramlvalidator.Generator.main(Generator.java:28)

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