Update Vibe Course module to version 3.5.1 for the BP 3.0.0 compatibility.
If you updated to BuddyPress 3.0 (released today) and the students in your site are not able to view mycourses section in their profile then this is the quick fix. BuddyPress 3.0 has deprecated some functions without fallback which is why the issue occurs.
Just add this code in functions.php of your child theme or WPLMS Customizer plugin wplms_chstomizer.php
This issue is resolved in Vibe course module 3.5.1 released on 19th May’18