up till now i have been using bitnami-wampstack-7.2.22-0 on localhost
Today I installed bitnami-wampstack-8.0.1-0-windows-x64-installer.exe on localhost
After the installation, I transfer my website to the htdocs folder and installed mysql.
However, the browser only shows a blank page. I uninstalled bitnami and did a new installation, with the same result.
In the logs file there is:
[Mon Jan 25 14:42:23.958815 2021] [php:error] [pid 11208:tid 1136] [client 127.0.0.1:54265] PHP Fatal error: Uncaught Error: Undefined constant "MB_OVERLOAD_STRING" ........
VirtualProtect() failed  Falscher Parameter
Any suggestions for this problem?