I have installed apache predictionio according to the document here: http://predictionio.apache.org/install/install-sourcecode/
No problem, it works. I added the necessary data. But I am having trouble installing the Similar Product Engine Template. Exactly I proceeded according to the document here: https://predictionio.apache.org/templates/similarproduct/quickstart I applied all my steps one by one. Many times. My Java version: *openjdk version "1.8.0_265" OpenJDK Runtime Environment (build 1.8.0_265-8u265-b01-0ubuntu2 ~ 18.04-b01) OpenJDK 64-Bit Server VM (build 25.265-b01, mixed mode)* My OS: Ubuntu 18.04.5 LTS Release: 18.04 Codename: bionic I came up to this step. *pio build --verbose* Then on this step, I'm having trouble *pio train* During this step I get the following errors and more: [ERROR] [Executor] Exception in task 0.0 in stage 605.0 (TID 171) [ERROR] [SparkUncaughtExceptionHandler] Uncaught exception in thread Thread[Executor task launch worker for task 171,5,main] [WARN] [TaskSetManager] Lost task 0.0 in stage 605.0 (TID 171, localhost, executor driver): java.lang.StackOverflowError at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:3037) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1598) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2366) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2290) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2148) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1647) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2366) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2290) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2148) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1647) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:483) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:441) at scala.collection.immutable.List$SerializationProxy.readObject(List.scala:490) at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) full logs: https://paste.ubuntu.com/p/zyzP9BGRXt/
