Cause: This error appear due to missing Common Enrollment Number in transporter details .

 1. As per the amendment in Rule 58, the transporter who is registered under GST in multiple States or Union Territory with same Permanent Account Number, they may apply for a unique common enrollment number in E-way bill system .

2. For this it is needed to fill details in FORM GST ENR-02 using any one of its Goods and Services Tax Identification Numbers.

3. This common enrolment number can be used by the tax payer in the e-way bill system and use it as Transporter-number in the e-waybill system.

4. Once the transporter has obtained a unique common enrolment number, he cannot use any of the Goods and Services Tax Identification Numbers for the purposes of e-way bill generation or updation of Transporter number in the e-way bills. 

To resolve this issue user should mention CEN number place on transporter GST number and again generate e-way bill JSON and upload on portal.