Just check that Spark and all necessary environments vars are present...
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SPARK_HOME=C:\opt\spark\spark-2.3.1-bin-hadoop2.7
HADOOP_HOME=C:\opt\spark\spark-2.3.1-bin-hadoop2.7
You don't have PYSPARK_PYTHON set
You don't have PYSPARK_DRIVER_PYTHON set
JAVA_HOME=C:\Program Files\Java\jdk1.8.0_181
Pyarrow Installed
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Starting or getting SparkSession and SparkContext...
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Transform and Roll out...
Starting Optimus Server...
Server started with process id 9544
Optimus successfully imported. Have fun :).