[VE][65] Error Message Feedback

I have received a number of errors such as this :

Line 75, column 608: document type does not allow element "p" here; missing one of "object", "applet", "map", "iframe", "button", "ins", "del" start-tag

....rd!</p><p>So, what should you do?</p><p>1. 



What does "missing one of "object", "applet", "map", "iframe", "button", "ins", "del" start-tag" mean?



Thank you for your help,

Mike