Hi Ganesha,
SonarQube 4.0 was released in Nov. 2013 and is now considered very old. It's two LTS versions behind, and you're not likely to get a lot of support for it.
The general advice is to upgrade to at least the current LTS version (5.6.6), although you should know that you're not going to be able to export directly to PDF/Excel even then. However, you'll have an easier time finding support if you try to automate data extraction using the web services.
Ann