Error: Unsuccessful response from data-sync: network [object Object]

Hi Guillaume, 

Appologies on the link, I didn't realize it would die when I updated the PR. Here's a permanent link to the code I wanted to share:

https://github.com/lucidsoftware/sample-lucid-extensions/blob/main/data-connector-example/editorextensions/data-connector-example/src/extension.ts

The important part is here:
 

  // Temporary workaround. You must call oauthXhr once before performDataAction will work
  const triggerOauth = await client.oauthXhr("lucid", {
    url: "https://api.lucid.co/folders/search",
    headers: {
      "Lucid-Api-Version": "1",
      "Content-Type": "application/json",
    },
    data: "{}",
    method: "POST",
  });
  const result = await client.performDataAction({
    dataConnectorName: "data-connector-1",
    actionName: "Import",
    actionData: { message: "ImportFolders" },
    asynchronous: true,
  });

The reason is due to a bug on our end that we're ironing out. Basically you must call `client.oauthXhr` once to trigger the authorization flow which fetches + stores the user’s OAuth token for use by the data connector.

If you're having trouble still, I wrote up a guide on how to get a minimal data connector working here: https://github.com/lucidsoftware/sample-lucid-extensions/tree/main/data-connector-example