Big problem when update from 2.3 to 2.4

[mahdialaklany]

Hi Sergey
how are you
You are very, very wonderful
I encountered a very big problem
After following the exact and very precise upgrade steps outlined. Shown on the link

https://blog.rukovoditel.net/rukovoditel-2-4-beta/

 After getting 2 successful product upgrade letters and upgrading the extension I have already received success messages and I am sure 1000% that the steps were executed with high accuracy and very successfully but then when you try to sign in you will see a blank blank page where there is nothing that does not have a registration form Access. Which contains your username and password
You can check the link for it

http://yanabiaa.org/erp2/

Note that after the upgrade you have cleared and emptied the browser cache
I hope the solution as soon as possible, you wonderful Sergey