I fixed the issue by commenting out the following:
[php][/php]
This helped me for like a day or so. Then the issue came back, but this time without the error message. It just didn’t allow me to log in.
So, someone suggested in another forum to disable my Firewall (windows 8 for me). I did, and the problem was fixed.
After I had gained access to my admin panel, then I enabled firewall again. I really don’t know how it does work, but my issue is gone since I did that… and my firewall it’s still enabled.
I use Firefox. I hope it can help someone facing the same issue. Good luck!
I run into the issue frequently. I have autologins for WordPress sites as I have several clients that have them, but trying to login again generally works.
On the same, I also have a similar issue logging into CPanel on occasions.