SONY ERICSSON WT19i unrooting problem

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http://forum.xda-developers.com – hi guys few days ago i unlock the boot loader of my phone. LWW with phone info: android version 2.3.4 build number 4.0.2.A.0.62 kernel version semcuser@semchost#1 i used the following tools to unlock my bootloder: "DooMLoRD_v4_ROOT-zergRush-busybox-su" after this my rooting status : boot loader unlock allowed: yes.. now i want is unroot. now i am using "DooMLoRD_v1_UNROOTING" but this i getting error. plz find the attachment help me... Attached Thumbnails   (HowTos)