E Invoice Request Failed

Error	

Error
Fernet key must be 32 url-safe base64-encoded bytes.

Data:
{}

Exception:
Traceback (most recent call last):
File “/home/erp/frappe-bench/apps/erpnext/erpnext/regional/india/e_invoice/utils.py”, line 710, in generate_irn
headers = self.get_headers()
File “/home/erp/frappe-bench/apps/erpnext/erpnext/regional/india/e_invoice/utils.py”, line 669, in get_headers
‘password’: self.credentials.get_password(),
File “/home/erp/frappe-bench/apps/frappe/frappe/model/base_document.py”, line 859, in get_password
return get_decrypted_password(self.doctype, self.name, fieldname, raise_exception=raise_exception)
File “/home/erp/frappe-bench/apps/frappe/frappe/utils/password.py”, line 59, in get_decrypted_password
return decrypt(result[0][0])
File “/home/erp/frappe-bench/apps/frappe/frappe/utils/password.py”, line 211, in decrypt
cipher_suite = Fernet(encode(get_encryption_key()))
File “/home/erp/frappe-bench/env/lib/python3.8/site-packages/cryptography/fernet.py”, line 34, in init
raise ValueError(
ValueError: Fernet key must be 32 url-safe base64-encoded bytes.

Getting this error while trying to generate e-invoice