Journal OJS 3 Error in menu sidebar and mising footer

Hi Sir, May I ask you a question?
Can you help me! My Web Journal OJS 3 just an error, i.e. the sidebar menu and the footer menu section are missing. I use the default theme Manuscript. and after an error I tried to restore the theme and settings in the css file but still nothing changed. why my OJS 3 Journal website suddenly has an Error on the sidebar menu and disappears at the bottom(footer) of the menu. help me please, my friend.

this is my url journal


and this is the normal appearance of my journal before it breaks or disappears sidebar menu and footer section

thanks you,
send me notification to my email or this forum.