Now seriously
1) What PHP you have?
2) Template full name?
3) System-->Global Configuration-->System > Errors > Max - see if you would see more error messages in admin area.
---
Helix II may not work with PHP 7.3 nor 7.2 because it's old template framework.
And you see those errors are from an extra installed by you extension, none of them is from JoomShaper. Some of them were prepared for old Joomla only.
--
Please fix at least problems with plugins. Maybe it's a source of menu problem.