Slim application error during paper submission

Anytime I try to submit an article on the submission page, I’m always having this “Slim Application Error”. Have tried many trucks and solutions online, but none of it was able to solve the issue.
Kindly help me out.
I use the latest version of the ojs.

Hello @Olabode_Adeleye,

Please do not post in your issue multiple times - this creates confusion. I see that you already have posted here: Slim application error when submitting paper - #2 by rcgillis, and I have replied there.

Best regards,

PKP Team