Custom Search in VBCS

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Custom Search in VBCS

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Hi i'm new to VBCS, i'm developing a sample application in which i enter employee details such as name, dob, age etc.. i calculated age based on a dob using formula{(new Date() -new Date($dateOfBirth) )/ (60*60*24*1000*365)}.

Now i want to search an employee whose age is greater than 30. I've followed a link that explains custom search query page in VBCS

https://blogs.oracle.com/shay/creating-custom-searchquery-pages-with-visual-builder   which works fine for other attributes such as name, but when i do same for age it shows following error(Error loading data for "null"  internal server error).