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One reason for this error message is when the java a previous instance is not yet entirely dead (as already described in Bug 236192) Please, check for other processes running and locking the workspace and if one is found, display the process ID Version: Mars.2 Release (4.5.2) Build id: 20160218-0600 on Debian Stable
2) plus the create time 3) if run by the same user - offer to kill it.