Upgrade version to 1.5 PBX does not appear in web page

Hi, I just upgrade Elastx version from 1.1-7 to 1.5, also I made a back up from version 1.1-7 and I tried to restore this back up in to version 1.5 from web page, after I did this, I could enter to web page but when I click in PBX part, nothing appears and after reload page nothing more appears, did I do something wrong during de restore??

I will appreciate your help

Thank and regards