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CCS 6.1: Problems saving workspace

When closing CCS, I get a pop-up titled: Problems saving workspace.

Details:

Problems occurred while trying to save the state of the workbench.
  Could not write workspace metadata 'C:/<pathGoesHEre>/workspaceName/.metadata/.plugin/org.eclipse.core.resources/.root/5.tree'.
  java.lang.NullPointerException

5.tree does exist.  (I'm not able to copy here due to none-printing chars that trash the display.)

Could you suggest a solution?