SVN WARNING MESSAGE: Clear update statuses operation failed

PROBLEM:

You get a warning message after an SVN operation like below:

Clear update statuses operation failed.
 0x00000004: The resource is inaccessible: resource_path ...


SOLUTION:

This happened after I excluded a project from the workspace and the repository, respectively, using Eclipse with subversion plugin.
The solution was achieved when I recreated the missing path, including it as project and into repository, using exactly the same original notations.
Then I committed the projects which caused the warnings and the messages stopped, but the fake projects were still there.
I deleted them and closed eclipse.
When reopened, I checked the same projects and problem had gone.
I've tried the method twice, successfully.