BiffException cannot be resolved to a type

`BiffException` is a class that is part of the Apache POI library, which is used for reading and writing Microsoft Office file formats such as Excel spreadsheets.

To resolve the error, you need to make sure that you have added the necessary POI library to your project's build path. You can download the latest version of the POI library from the Apache POI website: https://poi.apache.org/download.html

Once you have downloaded the library, you can add it to your project in one of two ways:

1. Add the JAR file to your project's build path:
- In Eclipse, right-click on your project in the Package Explorer and select "Properties"
- In the Properties dialog, select "Java Build Path" and click the "Libraries" tab
- Click the "Add External JARs" button and select the POI JAR file you downloaded
- Click "OK" to save the changes

2. Add the POI library as a dependency in your project's build file (e.g. pom.xml for Maven projects):
- Add the following dependency to your build file, replacing the version number with the latest version:

      <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi</artifactId>
        <version>4.1.2</version>
      </dependency>

- Save the changes to your build file and rebuild your project.

Once you have added the POI library to your project, you should be able to import the `BiffException` class and use it in your code without any errors.