500 Error on completing order?

[roxas-x2]

I'm getting a 500 Error on completing an order with "Shipping based on order totals". If I turn off all shipping settings then I can proceed with the payment through paypal, but as soon as I try to add shipping costs I get this error.

Anyone know what's the cause?

[Bagi Zoltán]

Hello, thank you for using Boss Cart. It might have a lot of reason. Maybe some part of the installation package was not uploaded correctly. If you want me to check this issue, please send me the administrator and ftp login details via private message or email bagi(at)bosscart.com.
Thanks