Exception in thread "main" java.lang.NullPointerException
at org.apache.xmpbox.xml.PdfaExtensionHelper.populatePDFAPropertyType(PdfaExtensionHelper.java:180)
at org.apache.xmpbox.xml.PdfaExtensionHelper.populatePDFASchemaType(PdfaExtensionHelper.java:159)
at org.apache.xmpbox.xml.PdfaExtensionHelper.populateSchemaMapping(PdfaExtensionHelper.java:116)
at org.apache.xmpbox.xml.DomXmpParser.parse(DomXmpParser.java:194)
at org.apache.pdfbox.preflight.process.MetadataValidationProcess.validate(MetadataValidationProcess.java:69)
at org.apache.pdfbox.preflight.utils.ContextHelper.callValidation(ContextHelper.java:84)
at org.apache.pdfbox.preflight.utils.ContextHelper.validateElement(ContextHelper.java:122)
at org.apache.pdfbox.preflight.PreflightDocument.validate(PreflightDocument.java:163)
at org.apache.pdfbox.preflight.Validator_A1b.runSimple(Validator_A1b.java:174)
at org.apache.pdfbox.preflight.Validator_A1b.main(Validator_A1b.java:135)
Major