stdin:1: '<name>' expected near '\'

[Sherokhi]

I had this error with a simple, write-on-file functions...

my_default_n = 0
function actualise(n or my_default_n)

    fa = io.open("C:/Users/perretje/Desktop/passed.txt", "a")
    fa:write("0", "\n")
    fa:close()

end

actualise()

can you help me ?