500 using IT Service Desk project type

I’m using Jira Plugin SDK.

I successfully installed Jira Software and Jira Service Desk from Gear | Applications page.

Then I created a new project with type “IT Service Desk”. I was then redirected to http://localhost:2990/jira/projects/ISD/welcome-guide but the page didn’t load.

A part of the stacktrace (the whole thing is too large):

2022-05-27 10:43:44,456 http-nio-2990-exec-9 ERROR [c.a.j.web.servlet.InternalServerErrorServlet] {errorId=fefb0ebb-9502-44bd-954e-d8a3f7b2dc67, interpretedMsg=, cause=java.lang.RuntimeException: com.atlassian.soy.renderer.SoyException: Unable to compile Soy templates at: com.atlassian.servicedesk.project-ui:soy, stacktrace=java.lang.RuntimeException: com.atlassian.soy.renderer.SoyException: Unable to compile Soy templates at: com.atlassian.servicedesk.project-ui:soy
:
:
Caused by: java.lang.IllegalStateException: Required plugin module com.atlassian.servicedesk.project-ui:soy was either missing or disabled

But I checked Managed Add-ons, all Soy modules are already enabled.

How can I fix this problem?

The error went away after restarting Jira Plugin SDK.