I want to enable time tracking within our Jira installation (version 5.0.2). Based on the documentation I also installed Jira Charting Plugin through the Plugin Manager. It installed version 1.8 of this plugin -> as recommended in the documentation. Finally, I restarted Jira and added two custom fields like explained in the documentation. I am done I guess.
Now, I want to test this report in a test project but whatever report I select I only receive the following error message:
(first lines only)
Could not execute action [ConfigureReport!default]:
Unknown constant tag 111 in class file com/atlassian/jira/web/action/browser/ConfigureReport<p><small>
<small><pre>java.lang.ClassFormatError: Unknown constant tag 111 in class file com/atlassian/jira/web/action/browser/ConfigureReport
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at...
Any idea?