HENTAUDA: A serious error was found in the SLC supplementary exam's results of Makawanpur district. According to the results, all the students who were registered for both Compulsory Mathematics and Optional Mathematics did not attend the exams. This, however, is just an error,  Humnath Sharma, Assistant District Education Officer said. From Makawanpur district, as many as 920 students had applied to appear in the Compulsory Mathematics test. Among them, only 887 appeared in the exam and remaining 30 did not attend the exam. The District Education Office surmised that error might have occurred because records of obtained marks in Compulsory and Optional Mathematics were missed.