java.lang.RuntimeException: java.lang.NullPointerException

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java.lang.RuntimeException: 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 org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)

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