Unable to start Thingworx 8.3 after installation

Hi,

I manage to get through all the steps in this guideline to install Thingworx PostgreSQL but cannot start it. 

I use :

sudo service tomcat8.5 start

It returns:

Using CATALINA_BASE: /usr/share/tomcat8.5/8.5.23
Using CATALINA_HOME: /usr/share/tomcat8.5/8.5.23
Using CATALINA_TMPDIR: /usr/share/tomcat8.5/8.5.23/temp
Using JRE_HOME: /usr
Using CLASSPATH: /usr/share/tomcat8.5/8.5.23/bin/bootstrap.jar:/usr/share/tomcat8.5/8.5.23/bin/tomcat-juli.jar
Tomcat started.

And i check the port though fuser and top  no service was running or listen to port 8080 ( the port i use in platform-settings.json ). Also i tried to access http://ip:8080, returns nothing. No tomcat was running. (If its run, it will return something e.g 401.

Output for catalina.out：

Error: Could not find or load main class usr.share.tomcat8.5.8.5.23.webapps.Thingworx.WEB-INF.
Error: Could not find or load main class usr.share.tomcat8.5.8.5.23.webapps.Thingworx.WEB-INF.
Error: Could not find or load main class usr.share.tomcat8.5.8.5.23.webapps.Thingworx.WEB-INF.
Error: Could not find or load main class usr.share.tomcat8.5.8.5.23.webapps.Thingworx.WEB-INF.

FYI，environment setup:

Distributor ID:	Ubuntu
Description:	Ubuntu 14.04.5 LTS
Release:	14.04
Codename:	trusty

java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
psql (PostgreSQL) 9.5.13

Server version: Apache Tomcat/8.5.23
Server built: Sep 28 2017 10:30:11 UTC
Server number: 8.5.23.0
OS Name: Linux
OS Version: 3.13.0-153-generic
Architecture: amd64
JVM Version: 1.8.0_131-b11
JVM Vendor: Oracle Corporation

Any suggestion how to solve the problem?