I still don't see this error.
Does the warning go away if you move \usepackage{bidi} to before \usepackage{fontspec} in sbllang.sty?
If not, what if you load sbllang.sty earlier in sblessay.cls (say, immediately after LoadClass[a4paper,12pt,titlepage]{article})?
I still don't see this error.
Does the warning go away if you move \usepackage{bidi} to before \usepackage{ fontspec} in sbllang.sty?
If not, what if you load sbllang.sty earlier in sblessay.cls (say, immediately after LoadClass[ a4paper, 12pt,titlepage] {article} )?