Error messages are there to tell you something. Read them carefully and they will give you valuable hints. They also give us valuable hints, so it is advisable to tell us what error message you get. So we don't have to (download any module you use and) execute your script just to find out what error message you got
I can see that you have lines like @code= ;. Probably you want @code=(0); instead. () is for lists while  is for references aka pointers to lists. Not that it changes anything, it seems the value is overwritten anyway. So @code=(); to clear the array would work as well
Also $geo->LookUp(@a[i]); should be $geo->LookUp($a[i]);. Your syntax probably still works because this is how array slices are specified, but it could lead to hard to find bugs
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