ClassNotFoundException: org.sparkproject.guava.cache.CacheLoader

This error occurs when the required class "org.sparkproject.guava.cache.CacheLoader" is not found in the classpath. This class belongs to the Guava library, which is used by Spark for caching and other utility functions.

To resolve this error, you need to make sure that the Guava library is included in your project's classpath. You can download the Guava library from the official website or add it as a dependency in your build tool (such as Maven or Gradle).

If you are using Spark, you can also try adding the following dependency to your build file:

<dependency>
  <groupId>com.google.guava</groupId>
  <artifactId>guava</artifactId>
  <version>28.2-jre</version>
</dependency>

Make sure to replace the version number with the appropriate version of Guava for your project.