Servlet class org.restlet.ext.servlet.ServerServlet is not a jakarta.servlet.Servlet

What could be causing this error?

    Caused by: jakarta.servlet.UnavailableException: Servlet class org.restlet.ext.servlet.ServerServlet is not a jakarta.servlet.Servlet        at org.eclipse.jetty.servlet.ServletHolder.checkServletType (ServletHolder.java:499)        at org.eclipse.jetty.servlet.ServletHolder.doStart (ServletHolder.java:377)        at org.eclipse.jetty.util.component.AbstractLifeCycle.start (AbstractLifeCycle.java:96)        at org.eclipse.jetty.servlet.ServletHandler.lambda$initialize$2 (ServletHandler.java:699)        at java.util.stream.SortedOps$SizedRefSortingSink.end (SortedOps.java:357)        at java.util.stream.AbstractPipeline.copyInto (AbstractPipeline.java:485)        at java.util.stream.AbstractPipeline.wrapAndCopyInto (AbstractPipeline.java:474)        at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining (StreamSpliterators.java:312)        at java.util.stream.Streams$ConcatSpliterator.forEachRemaining (Streams.java:735)        at java.util.stream.ReferencePipeline$Head.forEach (ReferencePipeline.java:658)        at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:724)

I'm running the web app from mvn jetty:run plugin