This should help you out. Your plugins aren't being read as installed.
They are located in [openX path]/etc/plugins/openX/openXInvocationTags.zip. Here is how to install them:
- Plugins are located in
[openX path]/etc/plugins/
- You can download the invocation code plugin directly from your server by going to
http://yourserver.com/etc/plugins/openXInvocationTags.zip
- To install them, switch to the administrator account and go to the Plugins tab
- Upload the plugin ZIP file you just downloaded
Here you go!