I keep getting stuck in the payment bottom sheet and the ClientState throws an error that is not understandable. Just says "ERROR".

You can see my implementation in the following link:
https://drive.google.com/file/d/1Sq2aGyQqe-hte5RQB4d87EL5mtN3J5Eg/view?usp=drive_link
I keep getting stuck in the payment bottom sheet and the
ClientStatethrows an error that is not understandable. Just says "ERROR".You can see my implementation in the following link:
https://drive.google.com/file/d/1Sq2aGyQqe-hte5RQB4d87EL5mtN3J5Eg/view?usp=drive_link