eclipse - First Kepler workspace is giving "Path must include project and resource name: /" for Maven project from SVN -

i've been using indigo reasonably quite while. today installed sts kepler. exported/imported preferences , team project set (many) projects checked out svn.

i've noticed when switch editor buffers particular maven project, following error repeated multiple times:

"path must include project , resource name: /"

this project checked out svn, , working on same project in indigo workspace, , wasn't seeing error.

i've examined in build path tab, , i've manually examined both .classpath , .project files.

the thing seems vaguely suspicious following block in .project file:

        <buildcommand>         <name>org.eclipse.ui.externaltools.externaltoolbuilder</name>         <triggers>full,incremental,</triggers>         <arguments>             <dictionary>                 <key>launchconfighandle</key>                 <value>&lt;project&gt;/.externaltoolbuilders/org.eclipse.wst.validation.validationbuilder.launch</value>             </dictionary>         </arguments>     </buildcommand>