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java.lang.NullPointerException: 	at TestNGpackage.excelpara.getExcelData(excelpara.java:24)	at TestNGpackage.excelpara.createData(excelpara.java:47)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)	at org.testng.internal.MethodInvocationHelper.invokeDataProvider(MethodInvocationHelper.java:135)