Unhappy [Q] MTK Droid Tools 2.51 problem

I just try to backup original ROM from Lenovo A1000G with MTKdroid tools 2.5.1
But when process begin prompt messages : ATTENTION! The sdcard isn't found system and userdata will not backup
but when i use mtkdroid tool v 2.4.8 my sd card is read by mtkdroid tools and backup process is suceded.
why mtkdroidtools v 2.5.1 can't read my sd card ?however it is the newer version.
and this is the log.
Attached Files
File Type: txt log.txt - [Click for QR Code] (77.0 KB, 39 views)