I am using the Amazon EC2 plugin to manage Jenkins build agents. The issue is on the information screen for launched agents.

https://jenkins.mycompany.com/computer/

/configure

Under the "Tags" section it shows a jenkins error page with the following stack trace.

Stack trace

javax.servlet.ServletException: org.apache.commons.jelly.JellyTagException: jar:file:/var/lib/jenkins/plugins/ec2/WEB-INF/lib/classes.jar!/hudson/plugins/ec2/EC2Computer/configure.jelly:94:61: <st:include> No page found '../EC2Tag/config.jelly' for class hudson.plugins.ec2.EC2Computer
at org.kohsuke.stapler.jelly.JellyFacet$1.dispatch(JellyFacet.java:103)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:684)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:777)
at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:381)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:684)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:777)
...

I have attached the full stack trace and a screenshot. The bug also seems to prevent the save button from appearing, so I am unable to save changes to the build agents.