Error on testing donate button: "The organization account is inactive"

[oligalma]

I have two personal sandbox accounts. I sent 1 euro from one to another and worked well.

Now I want to test a donate button with the dummy accounts. In the "business" field I put the account ID of  one of the dummy accounts:

<input type="hidden" name="business" value="XXXXXXXXXXXXX" />

However, after clicking the donate button it appears the following message: "We are unable to complete your donation. The organization account is inactive. ".

If I put my real Paypal account ID it works well, but if I put the account ID of any of the personal sandbox accounts it gives the previous error.

What should I do?

[oligalma · Accepted solution]

Finally I've found the solution. It wasn't working because I had this code:

<form action="https://www.paypal.com/donate" method="post" target="_blank">

And I needed to put this code:

<form action="https://sandbox.paypal.com/donate" method="post" target="_blank">