AIEE MY EYES

for invalid base:

{
  "error-list": [],
  "results": [
    {
      "charm": null,
      "error": {
        "code": "invalid-charm-base",
        "extra": {
          "default-bases": [
            {
              "architecture": "amd64",
              "channel": "20.04",
              "name": "ubuntu"
            },
            {
              "architecture": "amd64",
              "channel": "18.04",
              "name": "ubuntu"
            },
            {
              "architecture": "amd64",
              "channel": "16.04",
              "name": "ubuntu"
            },
            {
              "architecture": "amd64",
              "channel": "20.10",
              "name": "ubuntu"
            }
          ]
        },
        "message": "Instance key 'a5d51df0-c3d6-4fce-88dd-5b554e5f6e87' invalid 'base' in 'install' for charm_id=DksXQKAQTZfsUmBAGanZAhpoS4dpmXel name=ubuntu"
      },
      "id": "DksXQKAQTZfsUmBAGanZAhpoS4dpmXel",
      "instance-key": "a5d51df0-c3d6-4fce-88dd-5b554e5f6e87",
      "name": "ubuntu",
      "released-at": null,
      "result": "error"
    }
  ]
}


For revision not found: 

{
  "error-list": [],
  "results": [
    {
      "charm": {
        "id": "DksXQKAQTZfsUmBAGanZAhpoS4dpmXel",
        "license": "",
        "name": "ubuntu",
        "publisher": {
          "display-name": "charmers",
          "id": "K08R1CtJYwkNQlpljSBruPKfHgTtAKFK",
          "username": "charmers",
          "validation": "unproven"
        },
        "summary": "A pristine Ubuntu Server",
        "type": "charm"
      },
      "error": {
        "code": "revision-not-found",
        "extra": {
          "releases": [
            {
              "base": {
                "architecture": "amd64",
                "channel": "12.04",
                "name": "ubuntu"
              },
              "channel": "stable"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "12.04",
                "name": "ubuntu"
              },
              "channel": "candidate"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "12.04",
                "name": "ubuntu"
              },
              "channel": "beta"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "12.04",
                "name": "ubuntu"
              },
              "channel": "edge"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "14.04",
                "name": "ubuntu"
              },
              "channel": "stable"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "14.04",
                "name": "ubuntu"
              },
              "channel": "candidate"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "14.04",
                "name": "ubuntu"
              },
              "channel": "beta"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "14.04",
                "name": "ubuntu"
              },
              "channel": "edge"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "15.04",
                "name": "ubuntu"
              },
              "channel": "stable"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "15.04",
                "name": "ubuntu"
              },
              "channel": "candidate"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "15.04",
                "name": "ubuntu"
              },
              "channel": "beta"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "15.04",
                "name": "ubuntu"
              },
              "channel": "edge"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "16.04",
                "name": "ubuntu"
              },
              "channel": "stable"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "16.04",
                "name": "ubuntu"
              },
              "channel": "candidate"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "16.04",
                "name": "ubuntu"
              },
              "channel": "beta"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "16.04",
                "name": "ubuntu"
              },
              "channel": "edge"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "17.10",
                "name": "ubuntu"
              },
              "channel": "stable"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "17.10",
                "name": "ubuntu"
              },
              "channel": "candidate"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "17.10",
                "name": "ubuntu"
              },
              "channel": "beta"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "17.10",
                "name": "ubuntu"
              },
              "channel": "edge"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "18.04",
                "name": "ubuntu"
              },
              "channel": "stable"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "18.04",
                "name": "ubuntu"
              },
              "channel": "candidate"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "18.04",
                "name": "ubuntu"
              },
              "channel": "beta"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "18.04",
                "name": "ubuntu"
              },
              "channel": "edge"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "18.10",
                "name": "ubuntu"
              },
              "channel": "stable"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "18.10",
                "name": "ubuntu"
              },
              "channel": "candidate"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "18.10",
                "name": "ubuntu"
              },
              "channel": "beta"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "18.10",
                "name": "ubuntu"
              },
              "channel": "edge"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "19.04",
                "name": "ubuntu"
              },
              "channel": "stable"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "19.04",
                "name": "ubuntu"
              },
              "channel": "candidate"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "19.04",
                "name": "ubuntu"
              },
              "channel": "beta"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "19.04",
                "name": "ubuntu"
              },
              "channel": "edge"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "20.04",
                "name": "ubuntu"
              },
              "channel": "stable"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "20.04",
                "name": "ubuntu"
              },
              "channel": "candidate"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "20.04",
                "name": "ubuntu"
              },
              "channel": "beta"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "20.04",
                "name": "ubuntu"
              },
              "channel": "edge"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "20.10",
                "name": "ubuntu"
              },
              "channel": "stable"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "20.10",
                "name": "ubuntu"
              },
              "channel": "candidate"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "20.10",
                "name": "ubuntu"
              },
              "channel": "beta"
            },
            {
              "base": {
                "architecture": "amd64",
                "channel": "20.10",
                "name": "ubuntu"
              },
              "channel": "edge"
            }
          ]
        },
        "message": "No revision was found in the Store."
      },
      "id": "DksXQKAQTZfsUmBAGanZAhpoS4dpmXel",
      "instance-key": "a5d51df0-c3d6-4fce-88dd-5b554e5f6e87",
      "name": "ubuntu",
      "released-at": null,
      "result": "error"
    }
  ]
}