Error with Upfront for using appointments plugin

After I pick a date the confermation box comes up but there are not text field boxes; just empty spaces.

Then I click on Cancel (that doesn't even look like a button) and I get error at the top of the page:
Warning: DOMDocument::loadHTML(): Unexpected end tag : h4 in Entity, line: 2 in /home/massag46/public_html/ on line 26