On 2/12/2021 at 8:31 AM, dpo said:Yes, I deleted all the files and all the tables in the database. I tried to restore in different days and get the same problem.
Really strange
try to delete all folders under \var\cache...
They will be recreated automatically. I found a weird side effect when I edited a core file, which led to white screen, then I restored the original file but the white screen wouldn't go away. After deleting this cache folder it started to work again.