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Resolve 'Detecting library folders' error in Eclipse

Eclipse maintains a directory at the root of a project with the name ".settings."  If, for whatever reason, Eclipse can't seem to find this directory, or the files in it, Eclipse will report an error vaguely stating a problem "Detecting library folders."  Removing the .settings directory will solve the problem.

Presumably, Eclipse rebuilds any information it maintains in that directory, though it's not clear what the information is.  Assume that any arbitrary details that seem off might be associated with removing this folder.


The "Detecting library folders" error dialogue window.

Due to the non sequitur nature of the error, there isn't much context to work off of other than the "org.eclipse.wst.validation" identifier, and the "detecting library folders" pseudo-clue.  As such, there isn't much that comes back from searches around the web for solutions to the issue, but the combination of the three references below "did the trick."  While not perfectly describing the issue, they did lead to the solution.

NOTE:  The Stack Overflow article specifically mentions Zend Studio instead of Eclipse.
NOTE:  The second resource, is from a Chinese site and mentions the issue as it relates to Mylyn, but the solution to the error for Mylyn was the same as for Eclipse.  UPDATED 02/02/2017:  This resource appears to be the victim of link rot, but will remain for the time being for the sake of citation.
NOTE:  The third item is also from Stack Overflow.  From what can be gleaned from the second resource, this resource is the inspiration of the solution described in the second one.


Resources

Error “Detecting Library Folders” in Zend Studio
http://stackoverflow.com/questions/25947959/error-detecting-library-folders-in-zend-studio

"org.eclipse.wst.validation" has been removed
http://www.csdn123.com/html/topnews201408/65/13065.htm
(Link appears to be dead.)

updating maven project has encountred
http://stackoverflow.com/questions/21414565/updating-maven-project-has-encountred

If hunting for reasons why this situation may arise, at the very least, moving projects around as described in another article may do it.  See "Migrating Eclipse projects to new locations" for more.
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