# Internal Server Error when attempting to Import Slack

**URL:** <https://forums.rocket.chat/t/internal-server-error-when-attempting-to-import-slack/5032>\
**Category:** Community Support\
**Created:** [November 9, 2019, 6:13pm UTC](https://forums.rocket.chat/t/internal-server-error-when-attempting-to-import-slack/5032 "2019-11-09T18:13:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lax4ever](https://avatars.discourse-cdn.com/v4/letter/l/f05b48/32.png) [@lax4ever](https://forums.rocket.chat/u/lax4ever)\
**Post date:** [November 9, 2019, 6:13pm UTC](https://forums.rocket.chat/t/internal-server-error-when-attempting-to-import-slack/5032/1 "2019-11-09T18:13:33Z")

</div>

### Description

Whenever I attempt to start the import process (specifically, clicking on the Slack or Slack Users button in the Import menu), an internal server error happens, which is logged as:

I20191109-17:45:49.431(0) Exception while invoking method ‘getSelectionData’ TypeError: Cannot read property ‘map’ of undefined at SlackImporter.getSelection (app/importer-slack/server/importer.js:556:43) at MethodInvocation.getSelectionData (app/importer/server/methods/getSelectionData.js:30:30) 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:719:19) at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1234:12) at DDPServer.\_CurrentWriteFence.withValue (packages/ddp-server/livedata\_server.js:717:46) at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1234:12) at Promise (packages/ddp-server/livedata\_server.js:715:46) at new Promise () at Session.method (packages/ddp-server/livedata\_server.js:689:23) at packages/ddp-server/livedata\_server.js:559:43

### Server Setup Information

- Version of Rocket.Chat Server: 2.1.1
- Operating System: Ubuntu 18.04.3 LTS
- Deployment Method: snap
- Number of Running Instances: 1
- Proxy: nginx

### Any additional Information

This came about after I first attempted to Import. I was able to navigate to /admin/import/prepare/slack and chose a zip file, but I did not initiate the actual import. I have not be able to return to this page since.