Error 418 Dream Host has no idea how to help me

Hello, I continue to receive a 418 error that says the following below.

"unused

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@mysite.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log."

I noticed this error only appears after I have logged out multiple
times after testing another user account on my site. The error only
appears from the device I am using at that time. If I switch to my
mobile device and try to log in it's fine however if my mobile device
becomes connected to the wifi that the computer is also connected to
it gives me the error message as if it is blocking my IP address. I
say this because once off of Wifi the log in/log out works perfectly
fine.