AL (ال) = THE in the arabic language.And if there is no AL (ال) in most arabic words,it is definataly A.As in an example shows below:
The door =الباب
Door or a door = باب
And so on.
I did it again: gate instead of door, but it is not accepted.
There are virtually no articles, such as "a" or "the" in Arabic. Why require it here?
Because there's a significant difference between 'a' and 'the'. There are many languages that work the same way.