bug: ethereal failed to access chaintim service

[hernanirvaz]

hello there, need help with this cryptic error in version 2.11.5:

ethereal validator withdraw
--connection=http://<IP_el>:8545 --consensus-connection=http://<IP_bn>:5052 --allow-insecure-connections
--withdrawal-amount=1eth
--validator=<my_type02_validator>
--from=<my_withdrawal_add>
--verbose

Error: failed to access chaintim service
failed to obtain spec: failed to unmarshal data
json: cannot unmarshal array into Go value of type string