Can't flash TW-based roms on i9505

hi guys,today i want to discuss about a weird issue that happened on my i9505
before i did anything was having that rom: http://forum.xda-developers.com/gala...5-5-5-t3195202
then after that i decied to flash this rom : http://forum.xda-developers.com/gala...i9505-t3027063
but then i got this error on TWRP :

Code:

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Upating partition details..
...done
Full SELinux support is present.
Running boot script

Finished running boot script
MTP Enabled
Installing'/sdcard/download/Kushan_Rom_v.7.0'...
Checking for MD5 file...
Skipping MD5 check: no MD5 file found
================================
Kushan Touchwiz Lollipop ROM v.7.0 I9505
================================
This may take several mintutes, please wait...

Wiping OS...
Wipe Complete!
Installing System,  please wait...
symlink: some symlinks failed
E:Error executing updater binary in zip '/sdcard/Download/Kushan_Rom_v.7.0.zip'
Error flashing zip '/sdcard/Download/Kushan_Rom_v.7.0.zip'
updating partition details...
...done

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when i flash an another TW-based rom i get the same error,but when i flash an cm-based rom no errors at all
i can flash stock rom, but the weirdest thing is that download mode recognizes the stock rom as custom rom:confused:
please help:(