I don't get those error messages using just the code you've provided in an HTML5 document. My first guess would be that you have angled quotes or curly quotes in your original code, and not straight quotes as in your sample above. Check that, and if that doesn't help, then post the HTML for the whole page, so we can see what else is going on.
It is not necessary to put the same title on both the link and the image, nor to have the same text as alt text and as title for the image. As I understand it, a screen reader will read out the title of the link, the title of the image and the alt text of the image, so in this instance users will hear the same text repeated three times - somewhat irritating, I would think.
There's a very helpful article about alt text here: http://webaim.org/techniques/alttext/