Dear sir,
In reference to your query, please note that the forms are yet to be made active for the purposes of filing the return and hence you are receiving the error.
Please wait for some days when the filing would be active and thereafter you can proceed to file.
Please advise in case of any further clarifications.
Thanks & Regards,
CA Aditya Dhanuka.
https://www.linkedin.com/in/aditya-dhanuka-69824451/