This is an error show when an attribute contained in a tag does not
contain a value and that a value was expected.
Or this can also be due to syntax error in the HTML tag.
Check the definition
of the attribute.
Give a value to the tag.
Or correct the wrong/unkown tag.
<a> attribute href lacks value
BAD <a href>My Link</a> GOOD <a href="my_link.html">My Link</a>