Unable to pass vault credentials to metabot as input parameters in v11

I am facing trouble while passing vault credentials to metabot as input parameters and throwing below error-

Things I tried-

1. Checked my user roles & privileges. Attaching the roles that I have.
2. Changed output parameter variables.
3. Restarting my client services post refreshing the roles.
4. Validated the locker credentials.

Note-

1. This is v11.
2. This command was working earlier and it is part of a production bot that runs. Now that I want to update the credential, I am not able to edit and save changes.
3. I have checked out the task bot that is calling this metabot.

Kindly help.