Typically, the cause of the above Eclipse error is due to some corruption issue with the current workspace. To fix that problem, you can create a new workspace.
Use the Designer, File Menu → Switch Workspace → Other.
This launches the same workspace launcher with the option to copy settings.
Before you do it, first export your projects if you have any.
Then make the workspace change and import them.
#webMethods#webMethods-General#Integration-Server-and-ESB