Suggestions

in order to get tholos to work
some notes about setting tholos
from top dir(PROJECT_NAME) issued tree command

.
├── project.yaml
└── test-dev
    └── test
        ├── main.tf
        ├── params
        │   └── env.tfvars
        ├── plans
        │   └── plan.tfplan
        └── terraform.tfstate

params and plans dirs needs to be created
and empty env.tfvars and plan.tfplan
project.ymal:

---
project: PROJECT_NAME

region: eu-west-1

encrypt-s3-state: true

accounts:

  test-dev:

    profile: default

    account_id: ACCOUNT_ID

    roam-role: ROLE_NAME