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

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org.apache.poi.openxml4j.exceptions.InvalidOperationException: Can't open the specified file:

This exception has no message.

org.apache.poi.openxml4j.exceptions.InvalidOperationException: Can't open the specified file: [org.apache.poi.openxml4j.exceptions.invalidoperationexception：无法打开指定的文件：] - 问题-字节技术

This exception has no message.

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)