Contacts restoring problems on Android after Rom change(I installed Cyanogenmod 7)

Hi, I installed NeroBackitup 2014 mobile version for android on my phone and i did a backup on sd card then i installed another Rom for android and now I can't restore all the contacts, it restored only my preferred contacts also if it see 151 contacts in the backup file, it restored only a part of it.How could I solve the problem?thanks
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