Sandbox Business Set -up

[Sp3nny]

I am testing my www business site with sandbox paypal.

I have set up in the sandbox, with a UK business and personal account.  I get an error after clicking the Buy Now button, as copied below, which prevents me from testing the full process of placing and paying for a (dummy) online order.  I am testing on localhost, using a PHP developed website.

Has anyone experienced this in Sandbox and do they know whats going on and can point to a fix?

The button has some of the initial basic input code from Pay Pal, "copied in part" below as:

<form action="https://www.sandbox.paypal.com/cgi-bin/webscr" form method="post">
<input type="hidden" name="cmd" value="_cart">
<input type="hidden" name="BUSINESS" value=" ">
<input type="hidden" name="currency_code" value="  "") ?>">

The error I get after clicking "Buy Now"

Error Detected

Error Message Some required information is missing or incomplete. Please correct your entries and try again.