If user receives this import error that means the mentioned HSN code is not present on NIC or IRP and hence throwing error as “Invalid HSN”.

User require to enter correct HSN code and reprocess the invoices for E-Way Bill or E invoice generation.

Also find Steps to check HSN Code of your product and Services:

Step 1: Open e-way bill portal Step

Step 2: Go to 'Search'

Step 3: Select 'Product & Services'

Step 4: Enter HSN code or Name of product & Captcha

Step 5: Clicks 'Go'

Please go through the following link

For EWay Bill  https://ewaybillgst.gov.in/Others/ProductSearch.aspx

For Einvoice site  https://einvoice1.gst.gov.in/Others/Product