I try to adding a link to the project sidebar, but it is not work。
so I want some help。
my atlassian-plugin.xml looks like this:
This is a TestCase
my project sidebar looks like this:
I do not know why the link is not in the sidebar.
but when I try to visit this link ，it is works
I guess your intent is to create a project tab panel. You might use https://developer.atlassian.com/server/jira/platform/project-tab-panel/ instead of using web-item/web-panel. This one always works for me.
If there is any reason, why you want to use these modules instead, I recommend to check Jira log files, you may find some exceptions there.
Hope it helps.