Weka e problemi strani

[Lordhark]

Slave ragazzi io ho questo file csv così configurato:

CALL,CMP,CWD,INC,INT,JC,LDS,LEA,MOV,MOVSB,MOVSW,POP,PUSH,REP,XOR,Nomi_Programmi
0,0,0,0,0.053639847,0,0.007662835,0,0.030651341,0.007662835,0.022988506,0.099616858,0.107279693,0.007662835,0.019157088,1.asm
0,0,0.007662835,0,0.053639847,0,0.007662835,0,0.038314176,0.01532567,0.019157088,0.099616858,0.107279693,0.007662835,0.011494253,2.asm
0,0,0,0,0.053846154,0,0.007692308,0,0.030769231,0.007692308,0.023076923,0.1,0.107692308,0.007692308,0.011538462,3.asm
0,0,0,0,0.053639847,0,0.007662835,0,0.038314176,0.01532567,0.019157088,0.099616858,0.107279693,0.007662835,0.019157088,4.asm
0,0,0,0,0.052631579,0,0.007518797,0,0.033834586,0,0.018796992,0.097744361,0.105263158,0.007518797,0.018796992,5.asm
0,0,0,0,0.062962963,0.007407407,0.007407407,0,0.037037037,0,0.018518519,0.096296296,0.103703704,0.007407407,0.011111111,6.asm
0,0,0,0,0.062962963,0.007407407,0.007407407,0,0.037037037,0,0.018518519,0.096296296,0.103703704,0.007407407,0.011111111,7.asm
0.008658009,0,0.012987013,0,0.086580087,0.008658009,0,0.017316017,0.043290043,0.017316017,0.038961039,0.069264069,0.069264069,0,0.012987013,8.asm
0,0,0.007434944,0.007434944,0.063197026,0.007434944,0.007434944,0,0.037174721,0.007434944,0.022304833,0.096654275,0.104089219,0.007434944,0.011152416,9.asm
0,0,0,0,0.053231939,0,0.007604563,0,0.034220532,0,0.019011407,0.098859316,0.106463878,0.007604563,0.019011407,10.asm
0,0.007843137,0.007843137,0,0.054901961,0,0.007843137,0,0.039215686,0.007843137,0.023529412,0.101960784,0.109803922,0.007843137,0.011764706,11.asm
0,0.007462687,0,0,0.063432836,0.007462687,0.007462687,0,0.037313433,0.014925373,0.018656716,0.097014925,0.104477612,0.007462687,0.01119403,12.asm
0,0.007874016,0,0,0.05511811,0,0.007874016,0,0.039370079,0,0.019685039,0.102362205,0.11023622,0.007874016,0.011811024,13.asm
0,0.00754717,0,0,0.064150943,0.00754717,0.00754717,0,0.037735849,0.00754717,0.022641509,0.098113208,0.105660377,0.00754717,0.011320755,14.asm
0,0.007722008,0,0.007722008,0.054054054,0,0.007722008,0,0.038610039,0,0.019305019,0.1003861,0.108108108,0.007722008,0.019305019,15.asm
0,0.007692308,0,0,0.053846154,0,0.007692308,0,0.042307692,0.007692308,0.023076923,0.1,0.107692308,0.007692308,0.019230769,16.asm
0,0.0078125,0.0078125,0,0.0546875,0,0.0078125,0,0.03125,0.015625,0.01953125,0.1015625,0.109375,0.0078125,0.01171875,17.asm
0,0,0,0.007220217,0.061371841,0,0.007220217,0,0.036101083,0.014440433,0.018050542,0.101083032,0.108303249,0.007220217,0.018050542,18.asm
0,0,0,0,0.061371841,0,0.007220217,0,0.039711191,0.007220217,0.02166065,0.101083032,0.108303249,0.007220217,0.010830325,19.asm
0,0,0,0,0.071174377,0.007117438,0.007117438,0,0.042704626,0.007117438,0.021352313,0.099644128,0.106761566,0.007117438,0.010676157,20.asm

Ho necessità di generare degli alberi decisionali, lo importo in weka, vado in classify, scelgo il mio albero ( j48 per esempio ) scelgo l'attributo da usare per il confronto ( nel mio caso nome_programmi ) e faccio Start, ora quello che ottengo è sempre e comunque questi 2 valori:

Correctly Classified Instances           0                0      %
Incorrectly Classified Instances        20              100      %

Qualcuno di voi sa dirmi il perchè??? Grazie mille!