Casual taxable person-E-Invoice - Goods and Services Tax - GST

Our company is applicable for E-Invoice and we have one Casual Taxable Person (CTP) registration. We tried to generate E-Invoice form E-Invoice Tool but below error occurred while generate E-Invoice. Error Code-2300- Supplier GSTIN should be of type Regular or SED My question Is E-invoice is applicable for CTP Registration? If Yes, Can you please help us on above error