Hi mbrsolution thank you,
No security plugin, Am talking about this plugin’s update. Here’s the full error report:
WordPress > Error
Warning! Simple Membership plugin cannot process this login request to prevent you from getting logged out of WP Admin accidentally.
You are logged into the site as an ADMIN user in this browser. First, logout from WP Admin then you will be able to log in as a member.
Alternatively, you can use a different browser (where you are not logged-in as ADMIN) to test the membership login.
Your normal visitors or members will never see this message. This message is ONLY for ADMIN user.