Scala file cannot be edited in Scala-IDE -

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i trying implement micro-service in scala , decided use scala-ide editor advised. s.o ubuntu 14.04 64, , using java 1.7 , scala-ide version downloaded here. created project using this tutorial, can't edit within scala editor file created (like there lock on file itself). enter image description here

please notice project has scala nature. please advise how solve issue.


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