This is an occasional error. 

Google blocks fast requests from the same IP. When doing searches, be sure to take a 1-2 minute pause in between searches.


You can also open any Google page in your browser (like www.google.com ) and perform a search. You will then see CAPTCHA, just enter it and continue working with CurationSoft.


You can learn more here:

https://support.google.com/websearch/answer/86640