Getting alot of W3C Validation errors

Hi there,

The guy that is doing my SEO is concerned.
He is getting a load of validation errors:

"1 http://theskillsstudio.co.za/courses/promoter-training-course/ Promoter Training Course | The Skills Studio 180 error(s) 10 warning(s) 54 error(s) 119 warning(s)"
"2 http://theskillsstudio.co.za/courses/promoter-training-exam-re-write/ Promoter Training Exam (Re-Write) | The Skills Studio 59 error(s) 8 warning(s) 54 error(s) 119 warning(s)"
"3 http://theskillsstudio.co.za/courses/promoter-training-exam/ Promoter Training Exam | The Skills Studio 59 error(s) 8 warning(s) 54 error(s) 119 warning(s)"
"4 http://theskillsstudio.co.za/courses/ All Courses | The Skills Studio 16 error(s) 15 warning(s) 59 error(s) 161 warning(s)"
"5 http://theskillsstudio.co.za/course-sign-up/ Course Sign Up | The Skills Studio 15 error(s) 2 warning(s) 55 error(s) 119 warning(s)"
"6 http://theskillsstudio.co.za/course_category/promoters Courses | The Skills Studio 12 error(s) 11 warning(s) 50 error(s) 132 warning(s)"
"7 http://theskillsstudio.co.za/part-time-promoter-jobs-johannesburg/ Promotion Companies in Johannesburg | Promoter Jobs | Gallery | The Skills Studio 12 error(s) 10 warning(s) 59 error(s) 161 warning(s)"
"8 http://theskillsstudio.co.za/news-promotion-jobs-for-students-johannesburg/ Promotion Jobs for Students in Johannesburg | The Skills Studio News | The Skills Studio 12 error(s) 10 warning(s) 59 error(s) 161 warning(s)"
"9 http://theskillsstudio.co.za/part-time-promoter-jobs/ Part-time Promoter Jobs | Promotions & Training | The Skills Studio | The Skills Studio 12 error(s) 10 warning(s) 59 error(s) 161 warning(s)"
"10 http://theskillsstudio.co.za/about-courses/ About Courses | The Skills Studio 10 error(s) 10 warning(s) 59 error(s) 161 warning(s)"
"11 http://theskillsstudio.co.za/business/ Business | The Skills Studio 10 error(s) 10 warning(s) 59 error(s) 161 warning(s)"
"12 http://theskillsstudio.co.za/testimonials/ Testimonials | The Skills Studio 10 error(s) 10 warning(s) 59 error(s) 161 warning(s)"
"13 http://theskillsstudio.co.za/about/ About The Skills Studio | The Skills Studio 10 error(s) 10 warning(s) 59 error(s) 161 warning(s)"
"14 http://theskillsstudio.co.za/contact/ Contact | The Skills Studio 10 error(s) 8 warning(s) 59 error(s) 161 warning(s)"
"15 http://theskillsstudio.co.za/faq/ FAQ | The Skills Studio 7 error(s) 4 warning(s) 80 error(s) 168 warning(s)"
"16 http://theskillsstudio.co.za/instructor/TSS/ The Skills Studio 6 error(s) 3 warning(s) 45 error(s) 90 warning(s)"
"17 http://theskillsstudio.co.za/promoters/ Promoters | The Skills Studio 5 error(s) 1 warning(s) 80 error(s) 168 warning(s)"
"18 http://theskillsstudio.co.za/student-login/ Student Login | The Skills Studio 4 error(s) 4 warning(s) 54 error(s) 119 warning(s)"
"19 http://theskillsstudio.co.za/wp-login.php The Skills Studio › Log In 0 error(s) 1 warning(s) 4 error(s) 78 warning(s)"

Need this fixed URGENLTY please