Hi,
It seems our struts plugin is not compatible starting with struts2 2.3.24, however i ran a quick test and it seems this error is not fatal and the application should work.
I also ran some reload tests and it seems changing old actions work however new actions aren’t detected. As a workaround you can edit an existing action to trigger the reload of the new one.
We will be looking into fixing the issues with 2.3.24 support.