Make sure you're using the latest sider for PES 2020 or 2021 - at least version 6.4.0 for PES 2020 and at least version 7.1.0 for PES 2021.
How To Properly Install PES 2021 Stadium Server
Make sure you're using the latest sider for PES 2020 or 2021 - at least version 6.4.0 for PES 2020 and at least version 7.1.0 for PES 2021.