API ➔ debug POST: /api/v1/downloadPublicImportFile
Meteor ➔ method downloadPublicImportFile -> userId: J5fEjToAAvEcD9iG9 , arguments:  [ 'http://xxx.xxx.xxx.xxx/slack.zip', 'slack' ]
Slack Importer ➔ debug Slack is now at importer_uploading.
Slack Importer ➔ debug Slack is now at downloading_file_url.
API ➔ debug Success { statusCode: 200, body: { success: true } }
API ➔ debug Success { statusCode: 200, body: { success: true } }
API ➔ debug GET: /api/v1/getImportFileData?importerKey=slack
Meteor ➔ method getImportFileData -> userId: J5fEjToAAvEcD9iG9 , arguments:  [ 'slack' ]
API ➔ debug Success { statusCode: 200, body: { waiting: true, success: true } }
API ➔ debug GET: /api/v1/getImportFileData?importerKey=slack
[...]
API ➔ debug GET: /api/v1/getImportFileData?importerKey=slack
Meteor ➔ method getImportFileData -> userId: J5fEjToAAvEcD9iG9 , arguments:  [ 'slack' ]
API ➔ debug Success { statusCode: 200, body: { waiting: true, success: true } }
Slack Importer ➔ debug Slack is now at download_complete.
API ➔ debug GET: /api/v1/getImportFileData?importerKey=slack
Meteor ➔ method getImportFileData -> userId: J5fEjToAAvEcD9iG9 , arguments:  [ 'slack' ]
API ➔ debug get getImportFileData threw an error: Error: "toString()" failed
    at stringSlice (buffer.js:578:45)
    at Buffer.toString (buffer.js:633:10)
    at SlackImporter.prepareUsingLocalFile (app/importer/server/classes/ImporterBase.js:151:23)
    at MethodInvocation.getImportFileData (app/importer/server/methods/getImportFileData.js:64:37)
    at MethodInvocation.methodsMap.(anonymous function) (app/lib/server/lib/debug.js:62:34)
    at maybeAuditArgumentChecks (packages/ddp-server/livedata_server.js:1771:12)
    at DDP._CurrentMethodInvocation.withValue (packages/ddp-server/livedata_server.js:1689:15)
    at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1234:12)
    at resolve (packages/ddp-server/livedata_server.js:1687:36)
    at new Promise (<anonymous>)
    at Server.applyAsync (packages/ddp-server/livedata_server.js:1686:12)
    at Server.apply (packages/ddp-server/livedata_server.js:1625:26)
    at Server.call (packages/ddp-server/livedata_server.js:1607:17)
    at DDPCommon.MethodInvocation.Meteor.runAsUser (app/api/server/v1/import.js:36:20)
    at packages/dispatch_run-as-user.js:211:14
    at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1234:12)
    at Object.Meteor.runAsUser (packages/dispatch_run-as-user.js:210:33)
    at Object.get (app/api/server/v1/import.js:35:10)
    at Object._internalRouteActionHandler [as action] (app/api/server/api.js:324:31)
    at Route.share.Route.Route._callEndpoint (packages/nimble_restivus/lib/route.coffee:150:32)
    at packages/nimble_restivus/lib/route.coffee:59:33
    at packages/simple_json-routes.js:98:9
 => awaited here:
    at Promise.await (/app/bundle/programs/server/npm/node_modules/meteor/promise/node_modules/meteor-promise/promise_server.js:60:12)
    at Server.apply (packages/ddp-server/livedata_server.js:1638:14)
    at Server.call (packages/ddp-server/livedata_server.js:1607:17)
    at DDPCommon.MethodInvocation.Meteor.runAsUser (app/api/server/v1/import.js:36:20)
    at packages/dispatch_run-as-user.js:211:14
    at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1234:12)
    at Object.Meteor.runAsUser (packages/dispatch_run-as-user.js:210:33)
    at Object.get (app/api/server/v1/import.js:35:10)
    at Object._internalRouteActionHandler [as action] (app/api/server/api.js:324:31)
    at Route.share.Route.Route._callEndpoint (packages/nimble_restivus/lib/route.coffee:150:32)
    at packages/nimble_restivus/lib/route.coffee:59:33
    at packages/simple_json-routes.js:98:9
API ➔ debug Failure { statusCode: 400,
  body:
   { success: false,
     error: '"toString()" failed',
     stack: undefined } }