Records not collecting for particular date range

Hi
For West Lindsey council,
I am not able to collect any records for date range 20-Mar-2016 to 16-Apr-2016
getting output as -

Starting scraper.
Running scraping session: WestLindsey_Scraping_Session
Processing scripts before scraping session begins.
Scraping file: "Landing Page"
Landing Page: Processing scripts before a file is scraped.
Processing script: "WestLindsey - Init Script"
day == 20
month == 03
year == 2016
day == 16
month == 04
year == 2016
Landing Page: Requesting URL: https://planning.west-lindsey.gov.uk/planning/
Landing Page: Processing scripts after a file is scraped.
Scraping file: "Search Results Page"
Search Results Page: Requesting URL: https://planning.west-lindsey.gov.uk/planning/FlareXML.asp
Search Results Page: POST data: Db=L&Ward=All&StartDay=20&StartMonth=03&StartYear=2016&EndDay=16&EndMonth=04&EndYear=2016
Redirecting to: https://planning.west-lindsey.gov.uk/planning/flarexmlout/default.asp?stylesheet=navigation&xmldoc=XMLFiles\201668122541
Search Results Page: Extracting data for pattern "Untitled Extractor Pattern"
Search Results Page: The pattern did not find any matches.
The token "APPLICATION_NUMBER" has no regular expression.
The token "ADDRESS" has no regular expression.
Search Results Page: Extracting data for pattern "Untitled Extractor Pattern"
Search Results Page: The following data elements were found:
Untitled Extractor Pattern--DataRecord 0:
NUMBER_MATCHES=0
Storing this value in a session variable.
The token "NUMBER_MATCHES" has no regular expression.
Search Results Page: Processing scripts before all pattern applications.
Search Results Page: Extracting data for pattern "Untitled Extractor Pattern"
Search Results Page: The pattern did not find any matches.
The token "ADDRESS" has no regular expression.
The token "APPLICATION_NUMBER" has no regular expression.
Search Results Page: Untitled Extractor Pattern: Processing scripts once if no matches.
Search Results Page: Untitled Extractor Pattern: Processing scripts after all pattern applications.
Processing scripts after scraping session has ended.
Processing scripts always to be run at the end.
Scraping session "WestLindsey_Scraping_Session" finished.

I am getting the records for date range 11-May-16 to 7-Jun-16
getting output correctly with number of records

mu URL is -

https://www.west-lindsey.gov.uk/my-services/planning-and-building/view-applications-decisions-and-appeals/search-our-planning-application-database/