Due to the recent CrossRef API upgrade, we started to experience DOI submission problems in our OJS version, thus, we decided to upgrade our OJS 22.214.171.124 version to the latest OJS 126.96.36.199.
But during the upgrade process, we observe the following error.
We have the following configurations :
; Client output/input character set client_charset = utf-8 ; Database connection character set connection_charset = utf8 ; database driver driver = mysqli
The current database collation is
Is there any idea about the reason for this upgrade error?