Could use some help fixing this w3c error
I've run my site thru w3c and have received numerous errors. Of course, support says that they are not important. But it is my understanding, that clean code does make a difference from all my research reading, like for site speed and bot crawling. I'm in the process of fixing all the errors and could use some help with this one as I'm stumped. I'm not someone that's experienced with code writing. Thanks in advance.
w3c error
w3c.jpg
dashboard code
dashboard.png