500 | Internal Server Error

[DateguideTech]

Hello,
Please when I click on my service to login to my control panel from the client area, it redirects me to the home page with this message: 500 | Internal Server Error.
I used to login until this started happening.

Besides that, I cannot login to my control panel using the direct CP link. I get this error message: Hmm, login details do not seem to be correct. Please try again.

I need your help.

 

[DateguideTech]

Please I was able to login directly into the control panel now without using the client area. Even though the client area still gives me the same error.