Here's an example of how to use the IOIndexedException class from the Apache Commons IO library:

import java.io.IOException;
import org.apache.commons.io.IOIndexedException;

public class Example {
    public static void main(String[] args) {
        try {
            // some code that throws IOException
        } catch (IOException e) {
            throw new IOIndexedException("Error occurred while reading file", e, 0);
        }
    }
}

In this example, the try block contains some code that throws an IOException. The exception is caught and wrapped in an IOIndexedException object. You can pass the error message, causing exception and index of the error in the constructor of IOIndexedException.

Note: IOIndexedException is a class that is used to wrap IOExceptions and provide an index to indicate where the exception occurred. It is not present in org.apache.commons.io package and it is not part of any official release of Apache Commons IO.