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It happens nearly every time Failed to execute goal org.apache.maven.plugins:maven-clean-plugin:2.5:clean (default-clean) on project netbeans-minimap: Failed to clean project: Failed to delete C:\workspace\netbeans-minimap\target\nbm\netbeans\extra\modules\ext\com.github.mcheung63.netbeans.minimap\commons-vfs\commons-vfs.jar -> [Help 1]