Eclipse wont run: \.metadata\.log error

Try using a new workspace. To force the workspace window prompt you need to change the settings in <Eclipse_root_dir>\configuration\.settings\org.eclipse.ui.ide.prefs and set SHOW_WORKSPACE_SELECTION_DIALOG to true.

Source: Eclipse Community Forums

Go to ~\.metadata\.plugins\org.eclipse.core.resources You will find .snap file. Just delete it. Relaunch Eclipse.

It will work perfectly.

You don't have to delete your .metadata folder because in this way it's going to delete your preferences about your workspace. However delete snap files that exist inside your .metadata folder as well as the .lock files.

Also after you do this don't forget to do a clean start of eclipe

./eclipse -clean