I used aeroo report for generating xls report in openerp 7, I created ods file containing data as input file, and xls as output

I used python function return arabic string,
    def _test(self, data):
    res=[]
    for item in data :
        month_move=datetime.strptime(str(item.date), '%Y-%m-%d %H:%M:%S').year
        if month_move == date.today().year:
            res.append(item)
    return res,'الاتبللا'
and i have some date is an arabic letter, when i tried to print the report, i got this error msg:
Aeroo Reports: Error while generating the report. ascii
 I got that error if i use the function, but if i dont used it, the report generate correctly,
I got that error if i use the function, but if i dont used it, the report generate correctly,
I used Genshi package version 6.0, and libreoffice version 5.1, and openerp version 7 , and python version 2.7

 
     
    