PDF invoice 'Access to path is denied'

Having an admin issue within an order.

1) In 'Edit Order Details - x
2) Click on 'Invoice (PDF)' or 'Print packaging slip' and get the following:

URL: https:/www.domain.com/Admin/Order/PdfInvoice?orderId=4
ERROR: Access to the path 'C:\HostingSpaces\account\site.com\wwwroot\content\files\ExportImport\order_ed8642e9-ee2c-405b-be8a-8eaff8a6d285_2012-02-14-18-46-11.pdf' is denied.

It was working but all of a sudden it isn't.  Any ideas?

System info:
nopCommerce version:   2.40
Operating system:   Microsoft Windows NT 6.0.6002 Service Pack 2
ASP.NET info:   v4.0.30319
Is full trust level:   True


[UPDATE] I just changed the folder 'ExportImport' so it has 'Write' permissions and appears to work now.