External API : Validation in headline2 for "facebook" word is failing

Deploy an order having facebook word in headline of Ads.

E.g.

"ads": [
{
"id": "6a2e8ce0-e093-4abf-b80c-c98b125d97f2",
"headline1": "

{KeyWord: For You.}

",
"headline2": "Want facebook Your ",
"description": "Look With Hair Coloring. Come To Us For Great Looking Hair.",
"path1": "hair coloring ",
"path2": "NewYork"
},

Actual result:

It shows Internal Server Error 500.

Note: It works fine for headline1, description

Tomcat Log:

Address: http://orange.aq-qa2-front1:8833/deploymentapi/deployments/8446eb81-3238-4b7f-98d3-0a1229512416
Encoding: ISO-8859-1
Http-Method: PUT
Content-Type: application/json
Headers:

{accept-encoding=[gzip,deflate], Authorization=[Bearer 023cd899-6c7c-4012-baae-bddfed310846], connection=[Keep-Alive], Content-Length=[2140], content-type=[application/json], host=[orange.aq-qa2-front1:8833], user-agent=[Apache-HttpClient/4.1.1 (java 1.5)]}

--------------------------------------
2016-12-14 13:32:44 INFO LoggingOutInterceptor:253 - Outbound Message
---------------------------
ID: 233
Response-Code: 500
Content-Type: text/plain;charset=UTF-8
Headers:

{Content-Type=[text/plain;charset=UTF-8], Date=[Wed, 14 Dec 2016 13:32:44 GMT]}

Payload: No match found
--------------------------------------