When I run an app. I get this error: error while loading shared libraries: libssl.so.1.1: cannot open shared object file: No such file or directory

I'm trying to run BooktabZ(booktab). It's an application that allow me to read digital books but I get this error when I run it:

~$ booktab/usr/share/duDat/BooktabZ/btb: error while loading shared libraries: libssl.so.1.1: cannot open shared object file: No such file or directory