backup restore problem when updating to new version

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Hello All

In the process of upgrading to version 5.6.1.2 I acidentally overwrote concrete database with previous version

after doing the upgrade to 5.6.1.2 it gave me an error message when login in saying my id is duplicate, I had previously made a backup of concrete 5.5 database so I decided to try fix the error by restoring the old db

yes, I know foolish decision and now nothing works, no website nothing all I get is this error in my website http://www.iguanahost.pe

Fatal error: Exception thrown without a stack frame in Unknown on line 0

I am using c5whmcs theme for website. Unfortunatelly I dont have a backup of my home directory handy. Any advice as to how to fix this problem will be very much apreciated.

Thanks!
Derek