Error 500 Can't find bundle for base name openfire_i18n, locale en

Can anyone explain to me what this about and how do I fix it?? This comes up when I try to access the admin console page. Thanks, I would really appreacte some help with this. Does this has something to do with the java memeory usage?? The last time I accessed the page, the Java Memory was 99.7%. Also, we have 2 processes, openfired.exe and openfire.exe running and I believe it’s eating away at the server’s memeory. What’s that all about and how can I fix it? Help!!! Thanks.

Suddenly my server starting having this issue too.

Rolling back to 3.6.3 resolves the issue.

Avoid 3.6.4.