py4j.protocol.Py4JJavaError: An error occurred while calling o27.partitions in Cloudera CDH 5.5.0 VM, Spark 2.4.7, JDK1.8.0_181

Question

I am learning to use Spark on a personal computer with hardware capable of running Hadoop. Here\'s the config:

Cloudera CDH 5.5.0 w/ Cloudera Quickstart,