This error is almost always (98%) indicative of incompatible versions of your plugin and Eclipse. In the case of MyEclipse we try and be very specific about the version of Eclipse that is required for each release, even down to the Milestone releases that are/aren’t compatible.
If you are seeing problems like “Cannot create part” when opening a file, the fastest way to check if it is an installation error is to create a new workspace:
File > Switch Workspace > C:\tempworkspace (or another temp location) then hit OK
After restarting, create a new project and create a new file of the type you were trying to edit before when you had the problem. If the error persists then the issues is an installation one, if the error disappears then it is possible that you have corrupted plugin cache state in your workspace. If that is the case you can try restart MyEclipse using the -clean command line argument.
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This topic was modified 9 years, 5 months ago by support-tony. Reason: Minor edits