Hey Rick,
You might want to start a new thread in the SlickEdit Core forums, as this is an old, archived forum. Also, I looked through the .log file and I've never seen this error before.
As a sanity check, can you post the information from Help > About SlickEdit Core? It's weird but the offending method referenced in the .log file does not exist in Core 3.5...but it did in Core 3.4. Just to make sure you are running 3.5 I would like to see that information, feel free to take out any information from that dialog that you don't want posted, I just want to see the version.
If it turns out you don't have 3.5, you probably want to uninstall your version of the plug-in and install Core 3.5, as this is probably what you want anyways.
If you are running 3.5 (or switching to 3.5 doesn't fix the problem), have you tried starting a new workspace to try and get around the problem? I think this might work in your case. Instead of starting Eclipse with your old workspace, start a new one and add your projects. SlickEdit should automatically build a tag file for each project when it is loaded, and you can check Tools > Tag Files to make sure. There should be a tag file listed for each project in your workspace, and when you select the project tag file in the left pane you should see all the files in the project in the right pane. If it doesn't look like all the projects got tagged, manually retag the workspace at Tools > Retag Workspace.
Let me know if you can restart Eclipse without issue now, or if the problem still persists. I'll keep looking into the error in the .log file, there is one NPE I discovered (which is easy to fix) but I don't think that is what is at the root of this issue. Thanks for the report.
- Ryan