Cannot login after upgrade to OJS 3.2.1-2 (Unknown locale component LOCALE_COMPONENT_OJS_MANAGER)

i need help, i am upgrading OJS 2.4.8-5 to 3.2.1-2
upgrade is successful, i can see all my journals and articles, but i cannot login.
when i click on login link (on top right corner), it send me this blank page with message
Unknown locale component LOCALE_COMPONENT_OJS_MANAGER
i upgraded it with complete stand-alone package method.
i am using XAMPP (PHP 7 and Mysql 7) on windows x64.

i enable debug and this is come out:

Hi @Lemper.Abon,

PHP 7.0 isn’t supported by OJS 3.2.1-2. The requirement is PHP 7.2+

Hi @Lemper.Abon,

Did you unpack the OJS 3.x code over top of the OJS 2.x code? If so, you’ll have mixed the two codebases together, which can cause problems like this. It’s better to start with a clean OJS installation directory and only bring in the pieces you need. See the “Full Package” upgrade instructions in docs/

Alec Smecher
Public Knowledge Project Team