CWWBF0024E Process [YOUR_PROCESS] of application [YOUR_APP] is not stopped. Stop the templates manually before updating or uninstalling a process application

You have to stop the process template first, before any updates to the process can happen. It wont help to restart the application or even the server.

Go to websphere process server admin console /ibm/console.

Go to ‘Applications’ -> Enterprise Applications > YOUR_APP > EJB Modules > YOUR_APPEJB.jar

Go to Business Processes and stop the running process template. Save changes. There is no need to restart the server.

I have seen this exception in hats trace file (you get it with hats admin console):

Exception = com.ibm.hats.runtime.connmgr.RteException: HPS5109 Hostname [your_host_name]:2809 cannot be resolved. The default port for the RMI connector maybe wrong for your environment.
Look to the end of system.out log file of your server. There you should find a line like this:

ADMC0026I: RMI Connector available at port 2812

The port may be another, this is often the case for test environments. To make HATS work do the following:

There is a runtime.properties file inside your application.ear. There you can set adminPortNum to the port of your servers RMI connector or you go the HATS admin console ‘Getting Started’ -> ‘Management Scope’ where you can set it, too.

I currently work with HATS ( Host Access Transformation Services ) . I created some webservices to access HOST applications with it.
HATS admin console is deployed under /[YOUR_HATS_APPLICATION]/hatsadmin/admin.