# Spark libraries conflict with Hadoop libraries In some cases, library versions contained in JARs from PDI, Spark, Hadoop, AEL, and/or Kettle plugins may conflict with one another, causing general problems where Spark libraries conflict with Hadoop libraries and potentially creating AEL-specific problems. To read more about this issue, including how to address it, see the article [AEL and Spark Library Conflicts](https://pentaho-public.atlassian.net/wiki/spaces/COM/pages/222003239/AEL+and+Spark+Library+Conflicts) on the Pentaho Community Wiki. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.pentaho.com/install/9.3-install/pentaho-configuration/tasks-to-be-performed-by-an-it-administrator/set-up-the-adaptive-execution-layer-ael/troubleshooting-ael-cp/spark-libraries-conflict-with-hadoop-libraries-ael-troubleshooting.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.