zf@fontspec ...ntname zf@suffix " at f@size pt
unless ifzf@icu zf@set@...
l.29 ...tfamilyalfont[Scale=1.5]{arabswell_1.ttf}
I wasn't able to read the size data for this font,
so I will ignore the font specification.
[Wizards can fix TFM files using TFtoPL/PLtoTF.]
You might try inserting a different font spec;
e.g., type `Ifont<same font id>=<substitute font name>'.