The voucher export (/admin/Site/Vale.aspx) today doesn't use asynchronous processing (with file sent by email) and this ends up causing large exports to return error to the user.

1. In admin, access the Catalog module.
2. Browse through the menu Control of Campaigns > Vouchers.
3. To export a large number of vouchers (more than 1000, approximately).

• Option 1: In the list itself apply filters (for data/status), reducing the number of registers.
• Option 2: Redeem the vouchers through API.