If the Check Possible Errors option does not show any errors, and you are still unable to generate E-invoice, follow these steps.
Step 1. Go to Administration, select Configuration, and then click on Features & Options.
Step 2. Click on GST/VAT, then navigate to GSP Configuration. Click on Validate If it shows an error, try validating it using a different internet connection.
Step 3. If you encounter a password error, you can create a different password for GSP. To do this, open your Eway Bill Portal in any browser and log in to your ID.
Step 4. Ensure that you enter the correct GSTIN in the Party/Account Master.