mkcert failure

[sebelk]

On Fedora, after install, site command exists so:

Error: Command failed: /home/sergio/.small-tech.org/site.js/tls/local/mkcert-v1.4.2-linux-amd64 -install
The local CA is already installed in the system trust store! 👍
ERROR: failed to execute "certutil -A -d dbm:/home/sergio/.mozilla/firefox/6vet4bek.default-1435685446357": exit status 255

certutil: function failed: SEC_ERROR_LEGACY_DATABASE: The certificate/key database is in an old, unsupported format.


    at checkExecSyncError (child_process.js:630:11)
    at Object.execFileSync (child_process.js:648:15)
    at Function.createServer (/usr/local/bin/node_modules/@small-tech/auto-encrypt-localhost/index.js:98:22)
    at Object.smallTechHttps.createServer (/usr/local/bin/node_modules/@small-tech/https/index.js:42:56)
    at Site._createServer (/usr/local/bin/index.js:889:18)
    at Site.createServer (/usr/local/bin/index.js:722:24)
    at new Site (/usr/local/bin/index.js:337:10)
    at /usr/local/bin/bin/commands/serve.js:232:16
    at processTicksAndRejections (internal/process/task_queues.js:97:5) {
  status: 1,
  signal: null,
  output: [
    null,
    <Buffer >,
    <Buffer 54 68 65 20 6c 6f 63 61 6c 20 43 41 20 69 73 20 61 6c 72 65 61 64 79 20 69 6e 73 74 61 6c 6c 65 64 20 69 6e 20 74 68 65 20 73 79 73 74 65 6d 20 74 72 ... 259 more bytes>
  ],
  pid: 3008028,
  stdout: <Buffer >,
  stderr: <Buffer 54 68 65 20 6c 6f 63 61 6c 20 43 41 20 69 73 20 61 6c 72 65 61 64 79 20 69 6e 73 74 61 6c 6c 65 64 20 69 6e 20 74 68 65 20 73 79 73 74 65 6d 20 74 72 ... 259 more bytes>

Any ideas?
Thanks in advance!