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

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java.lang.NullPointerException:
at com.iopendr.xls.read.Xls_Reader.getRowCount(Xls_Reader.java:43)
at com.iopendr.test.DriverScript.start(DriverScript.java:106)
at com.iopendr.test.DriverScript.main(DriverScript.java:60)

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