... attribute "..." had invalid value "...." and has been replaced

Cause:

The attribute value is incorrect.
For a color, the value must be a name like "black" or begin with a # like "#FF00FF".

Solution:

Please check the type of the attribute and depending of his type, correct the value.

Here the attribute bgcolor is a color, the value should begin with a "#"

BAD    <td bgcolor="FF00FF">
GOOD   <td bgcolor="#FF00FF">

References:

W3c attribute: http://www.w3.org/TR/html4/index/attributes.html
W3c type: http://www.w3.org/TR/html4/types.html