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java.lang.NullPointerException: 	at com.uttesh.pdfngreport.util.pdf.GenerateTable.populateColumnHeader(GenerateTable.java:247)	at com.uttesh.pdfngreport.util.pdf.GenerateTable.generate(GenerateTable.java:63)	at com.uttesh.pdfngreport.util.pdf.SuccessTable.populateData(SuccessTable.java:40)	at com.uttesh.pdfngreport.util.pdf.SuccessTable.populateSingleTableData(SuccessTable.java:58)	at com.uttesh.pdfngreport.PDFGenerator.getTable(PDFGenerator.java:149)	at com.uttesh.pdfngreport.PDFGenerator.populatePassedListTable(PDFGenerator.java:97)	at com.uttesh.pdfngreport.PDFGenerator.generateReport(PDFGenerator.java:71)	at com.uttesh.pdfngreport.PDFReportListener.generateReport(PDFReportListener.java:91)	at org.testng.TestNG.generateReports(TestNG.java:1089)	at org.testng.TestNG.run(TestNG.java:1048)	at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:126)	at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:152)	at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:57)