Error after rooting galaxy ace s5830i Help please

i have already rooted my device with universal 2.3 root and it was fine it worked .
i have lately had to setup the new cm 7.2 update for my ace i downloaded recovery-clockwork reset my factory and swept the cash and taken in image of the system after the setup of CyanogenMod 7.2 the system was slow so i removed it and reset again the phone then restored my system
after restoring there was no root working even after rooting again with the same file it didn't work i downloaded unroot from here and unrooted but the file supersu didn't move and even i downloaded root for galaxy ace from here and rooted with it it didn't also root i reset and unrooted and rooted but it was no use it offers me that message and i can't do anything

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