after installing sj wall blog Quickstart 2.5 when i view site , i get nothing, no error no nothing just a blank white screen:(

banter.bb10bargainds.co.uk

Dear tony gregory,

Could you please send your site account to us? We will check directly.
For the security reason, please enter your site account in
Require Help
From Staff + Mod/Admin?

Thanks!

i ahve cured the blank screen issue, but it seems that no matter which version of quickstart i use i get the same error of

ERROR 500

You may not be able to visit this page because of:

an out-of-date bookmark/favourite
a search engine that has an out-of-date listing for this site
a mistyped address
you have no access to this page
The requested resource was not found.
An error has occurred while processing your request.
Please try one of the following pages:

Home Page
Search this site
If difficulties persist, please contact the System Administrator of this site and report the error below..

JHtml: :bootstrap not supported. File not found.

banter.bb10bargains.co.uk

Dear tony gregory,

Please re-install the template quickstart. In step 6 : Configuration , please click on 'Install Sample Data' button again.

Thanks!