Hi guys.
I recently bought a confluence server license and put it in my evaluation version that was data center type.
The system issued an alert saying that it would be necessary to do a migration so I followed the steps of this link:
https://confluence.atlassian.com/conf66/moving-from-data-center-to-server-943962858.html
My problem is that after doing so the conflunce does not open the login page but it shows me a page that says "Confluence had problems starting up" and "Could not load bootstrap from environment ... fatal ... ... NumberFormatException: null "

I suspect the confluence.cfg.xml file was overwritten in the final step of that tutorial and eventually caused this problem.
Please help.
What should I do?