Possible problem in the way meta tags are created in the header
|Reported by:||techstudio||Owned by:|
This ticket may be irrelevant depending upon how WordPress allows meta items to be written in the head.
First, check out this thread.
Many plugins are writing meta tags to the head with attributes that contain html. If this is being done by the WP core then html could be stripped before printing these to avoid the errors. If not, it must be fixed in the individual plugins and this doesn't matter.