I am getting an error that the GST number I have entered for the transporter is not valid. What should I do in this case to generate the E-Way bill?

If you're encountering an error stating that the GST (Goods and Services Tax) number you entered for the transporter is not valid while trying to generate an E-Way bill, there are a few steps you can take to address the issue:
1. check the GST number you entered for the transporter. Ensure that there are no typos or errors in the digits.
2. Check Space and junk characters in the GST Number.
3. Check the GSTIN number by validating that if it is suspended or canceled.
4. Remove the GSTIN number and renter and then generate again.
5. Or you can check GSTIN from the GST Portal Also, are as follows:
Step 1. Go to the official GST portal. The URL for the GST portal is https://www.gst.gov.in/.
Step 2. On the GST portal, find and click on the "Search Taxpayer" option. This is usually available on the homepage.
Step 3. You will be prompted to enter the GSTIN of the taxpayer you want to search for. Input the correct 15-digit GSTIN number in the provided field.
Step 4. Complete any captcha or security check that might be required to verify that you are a human user.
Step 5. After entering the GSTIN and completing the captcha, click on the "Search" button.
Step 6. The system will display the search results if the GSTIN is valid. You should be able to see the details of the taxpayer associated with the provided GSTIN.