2 Error messages when editing the translation

Error message 1: "Language code from Studio document:ja-JP! LanguageTool Plugin cannot assign any supported language. Please set language code manually."
Error message 2: LanguageTool server is not available. Please start server click Retry.

After confirming my translated segment, I got the above error 1 and then after pressing the OK button, I got the above error 2. When I press the button Cancel, my translated segment has been confirmed. Please let me know how I fix the problems.