osmo-sim-auth

Good evening. I would like to ask some questions about osmo-sim-auth. First of all i have installed it and i am capable of doing 2g authentications with the parameters -r -s However i face some problems with the 3g authentication. I have checked my cards through windows and they are usim. When i run the command /./osmo-sim-auth.py -r 00000000000000000000000000000000 -a ec9320c2c2120000c8b7de2a3449f1bd /i get as response the following/ Traceback (most recent call last): File "./osmo-sim-auth.py", line 114, in <module> handle_usim(options, rand_bin, autn_bin) File "./osmo-sim-auth.py", line 44, in handle_usim if len(ret) == 1: TypeError: object of type 'NoneType' has no len() /I tried to find where the problem is and i have found that the problem is possibly in the if statement in file USIM.py in line 296 ( /if self.coms()[2][0] in (0x9F, 0x61):/) i put before that line the following to see the value that is compared in the if /print self.coms()[2][0] /and i get as response the number 152 which in hex is 98. I also put a print 'aaaa' below the if statement to see if the print will be executed. Unfortunately the i didn't see the 'aaaa' message on the screen. Do you know what should i do or where to search to fix this problem? Thanks.