You can try deleting the directories listed in the error message after making a backup. Caused by : Loading rules failed: Duplicate class definition": For some reason LanguageTool is installed twice as an extension in LibreOffice/.
LIBREOFFICE VS OPENOFFICE FOR MAC MAC
Apache OpenOffice doesn't provide official 64-bit versions for Windows and Mac yet, so you will need a 32-bit Java on Windows and Mac.