Error in SDCARD/nFinityGB.zip ROM while installing custom ROM

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http://forum.xda-developers.com – Dear developers/experts user I had my htc tattoo phone rooted and installed clockworkmod recovery (by Maverix) but when he tried to install custom ROM from SDCARD after opening and verifying update package the recovery says " (pro.job.)"==tattoo " command not known Error in : SDCARD/nFinityGB.zip" I am getting this all time whenever I try to flash custom ROM in my tattoo which has android V 1.6. Kindly if someone can help me. (Note: the program "superuser permissions" crashes when i start it to run it) (HowTos)