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Go to Moderator Control Panel -> Warnings -> Find a member -> select member. It will not work because the URL is empty.

Fix in includes/mcp/mcp_warn.php
Find:

Code: Select all: $template->assign_var('U_POST_ACTION', "mcp.$phpEx$SID&i=warn&mode=warn_user");

Replace with:

Code: Select all: $template->assign_vars(array( 'U_POST_ACTION' => "mcp.$phpEx$SID&i=warn&mode=warn_user", 'U_FIND_MEMBER' => "memberlist.$phpEx$SID&mode=searchuser&form=mcp&field=username", ) );

Thanks.