I set up Apache and wrote Ch. 14 example 1 correctly, doubled checked httprequest.js and example 1 against the source code downloads, and they're all correct. However, when I try to validate the name or email fields I get this error:

[Error] SyntaxError: JSON Parse error: Unrecognized token '<'
parse (ch14_example1.html, line 102)
handleResponse (ch14_example1.html, line 102)
reqReadyStateChange (httprequest.js, line 9)

And then when I expand the error I get this:

"<br /> <b>Warning</b>: Cannot modify header information - headers already sent by (output started at /Users/jakesmolowe/Sites/ch14_formvalidator.php:1) in <b>/Users/jakesmolowe/Sites/ch14_formvalidator.php</b> on line <b>7</b><br /> <br /> <b>Warning</b>: Cannot modify header information - headers already sent by (output started at /Users/jakesmolowe/Sites/ch14_formvalidator.php:1) in <b>/Users/jakesmolowe/Sites/ch14_formvalidator.php</b> on line <b>8</b><br /> {"available":false,"searchTerm":"jmcpeak"}"

What's going on?

Thanks,

Jake

FWIW, Example 2 seems to work perfectly fine, so it would seem there's something up with the ch14_formvalidator.php file?

This Exercise 1 from chapter 14 works perfectly fine for me. So the php file is correct.
Maybe try install the WAMPServer and then try once again.

I'm running into the same error, did you have any luck resolving it? Apache 2.4.23 / PHP 5.6.27.

I run into the same error, is there a solution yet?