How to launch Thingworx flow

Hi,

I installed thingworx flow successfully yesterday and ran command "pm2 ls" showed the complete components at the time .   However ,  today when I open the VM machine but found "pm2 ls" shows nothing.  

What's I've tried: 

1. run command "sc start RabbitMQ / rabbitmq.service" but it tells me the service is already running.   

2. restart the workflow subsystem, but it doesn't help

3. I can access thingworx foundation with host and port which were specified when installing work flow, but I cannot open https://<host>:<port>/Thingworx/Composer/apps/flow/#/

If the workflow doesn't launch automatically,  how can I launch it manually ? 

---Version---

Thingworx 8.5.1 + Thingworx worx work flow 8.5.1 + Postgresql 10.11 + windows server 2016 .

Regards,

Sean