Hi @testyoung,
After running this example on my side (note: I'm not familiar with this application nor BMS systems), I noticed that the first page displayed in FreeMASTER is actually application home page from NXP site. FreeMASTER is not a fully featured web browser, thus some JS scripts are failing, to avoid this behavior I would recommend removing that page:
1. Right click on root element in Project tree, and open properties (it may be a bit annoying because you need first to close those popup errors)

2. Clear the "Description URL" input field (you can open that link in a web browser if you need it)

3. Confirm the change

Now you should see the BMS application control page. I don't have the setup to confirm the functionality but, after removing the link to NXP site I had no more JS errors.

To persist this change make sure to save the project.
Regards,
Iulian