小白 求指导

SuperOneClick v2.1.1.0
Checking drivers...
Killing ADB Server... OK 1.59s Starting ADB Server...
* daemon not running. starting it now on port 5037 *
* daemon started successfully * OK 4.13s Waiting for device... OK 0.03s 2.2.1
Getting manufacturer...
motorola
OK 0.03s Getting model...
ME525
OK 0.03s Getting version...
1296364622
OK 0.03s Checking if rooted...
True
OK 0.05s Installing BusyBox (temporary)... - Step #1
2290 KB/s (1062992 bytes in 0.453s) OK 0.52s Installing BusyBox (temporary)... - Step #2 OK 0.03s Rooting device... - Step #1
2153 KB/s (585731 bytes in 0.265s) OK 0.31s Rooting device... - Step #2 OK 0.03s Rooting device... - Step #3 OK 0.02s Rooting device... - Step #4
property service neutered. killing adbd. (should restart in a second or two)
OK 0.08s Rooting device... - Step #5 OK 4.05s Remounting /system with read-write access...
OK
OK 0.34s Creating /system/xbin...
mkdir failed for /system/xbin, File exists
OK 0.05s Installing su (/system/xbin)... - Step #1
Installing su (/system/bin)... - Step #1
startIndex cannot be larger than length of string.
Parameter name: startIndex
FAILED
root一直没成功的说，求原因。。

用QQ应用助手居然说我已经root了，其实没有啊。。