Why won't the free Google Search Box I added to my website work anymore?

I have a website that has been listed with Google for a few years. Then I added a new large section to it (all within a new folder, not in a subdomain).  I added a free Google Search Box to the new section by cutting and pasting in the code from Google's website.  I changed nothing in the code except for my URL as they instructed me to.  I tried the search box two days ago and it worked for the original site but not for the new part of the site (but I expected this because the new part is probably not yet indexed with Google).  I submitted the additional folder of my URL to Google to expedite the process of getting it indexed with Google.  Then, the next day, the search box didn't work at all and I got the error message.  Can you tell me why this is and what I can do to fix the problem?  Start Free Trial

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This is the whole error message from Google:  
FORBIDDEN
Your client does not have permission to get URL /custom?domains=www.dianablake.net&q=batik&sa=Search&sitesearch=www.dianablake.net&client=pub-1185634157404086&forid=1&channel=8239981232&ie=ISO-8859-1&oe=ISO-8859-1&cof=GALT%3A%23008000%3BGL%3A1%3BDIV%3A%23336699%3BVLC%3A663399%3BAH%3Acenter%3BBGC%3AFFFFFF%3BLBGC%3AFFFFFF%3BALC%3A0000FF%3BLC%3A0000FF%3BT%3A000000%3BGFNT%3A0000FF%3BGIMP%3A0000FF%3BLH%3A32%3BLW%3A75%3BL%3Ahttp%3A%2F%2Fwww.google.com%2Flogos%2FLogo_25wht.gif%3BS%3Ahttp%3A%2F%2Fwww.google.com%2F%3BFORID%3A1%3B&hl=en from this server. (Client IP address: 71.166.106.13)
 
We apologize for your inconvenience, but this request could not be processed. 
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