Memberpress Plugin not activating

Hi,

I’ve installed WP Courseware and I’ve installed the Memberpress Addon, but after activation this error comes up-
“WP Courseware – MemberPress addon: The MemberPress plugin has not been detected. Is it installed and activated?”, even though it has been activated

Any ideas why this is the case?

Thanks,
leary12

https://ww.wp.xz.cn/plugins/memberpress-addon-for-wp-courseware/