RouterOS Error on upgrade from 5.6 to 6.19

Hello!
Intro:
Firstly i couldnt install latest version (6.19) on my XenServer v.6.2.0-70446c
Maybe its problem with XenServer, but it stoped on boot every time i restarted it

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So I decieded to install another version that is availiable on download page 5.26.
Version 5.26 Installed successfull. I configured it and activate demo key. My target was only one Ipsec tunnel.
Everything was fine, but our companty decieded to increase VPN connections…

Problem:
So …Today our company decided to buy a Level6 License for our RouterOS.
I prepared my ID and decided to upgrade Os to the actual version.
Downloaded file fo my OS - routeros-x86-6.19.npk
Backuped my config and copied it.
Copyed it to RouterOS via Winbox to the file directory.
Rebooted my routerOS and got an error.

Restored older version of RouterOS -restored older snapshot of RouterOS in Xen with 5.26 version and restored config of mikrotik.

Technical Details:
RouterOS v5.26 installed on XenServer 6.2.0-70446c.
Intel Core i5 3470
8GB RAM
Motherboard Asus B75M-PLUS
Sata mode:AHCI
For MikroTik share 1cpu, 256mb RAM, 500mb hdd

I need to resolve this problem before purchase a License key, because I want to buy Latest full version of RouterOS.

Maybe its a citrix prolem, so i will post same post there too.

Sorry for my English :slight_smile:
Cant_boot.JPG
Fatal error Exception.JPG