Problem installing any zip from recovery

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http://forum.xda-developers.com – Hello, I have a galaxy ace S5830 phone. I wanted to install ICS 4.0 on it. The phone is rooted and runs 2.3.4. When I try to install any zip file from recovery it gives an error saying "E: Can't open /tmp/sideload/package.zip (bad)". I just cannot install any zip file. The phone has android recovery 3e. I formatted the OS (factory reset) but it didnt change anything. Formatted SD card too but no use. What is the possible reason behind this error? Any solution is highly appreciated. (HowTos)