# Facing Errors on Invoice Compliance (hashing invoice)

**URL:** <https://zatca1.discourse.group/t/facing-errors-on-invoice-compliance-hashing-invoice/10495>\
**Category:** SDK, web-based validator and sandbox\
**Created:** [July 4, 2026, 11:38am UTC](https://zatca1.discourse.group/t/facing-errors-on-invoice-compliance-hashing-invoice/10495 "2026-07-04T11:38:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![gnasani](https://avatars.discourse-cdn.com/v4/letter/g/c67d28/32.png) [@gnasani](https://zatca1.discourse.group/u/gnasani)\
**Post date:** [July 4, 2026, 11:38am UTC](https://zatca1.discourse.group/t/facing-errors-on-invoice-compliance-hashing-invoice/10495/1 "2026-07-04T11:38:01Z")

</div>

Im using .Net SDK in my C# Project to signing invoice B2C.

```auto
var cert = Encoding.UTF8.GetString(Convert.FromBase64String(deviceInfo.SecurityToken));
var res = new EInvoiceSigner().SignDocument(eInvoice, cert, deviceInfo.PrivateKey);

```

**Im already generated Final CSID (**/e-invoicing/simulation/production/csids\*\*).\*\*  
When I validate the signed invoice by (ZATCA SDK) in ( [Zatca](https://sandbox.zatca.gov.sa/Compliance) ) I recive the below errors:

 ![image](https://europe1.discourse-cdn.com/flex013/uploads/zatca1/original/2X/0/08bcea4d2391ec6ddae3d77f44c3dceb0a0a264f.png)  
**I need to know how solve these errors?**