Problem with encryption key

[Majkel97]

Describe the issue/error/question

Hello,
We have a problem with encryption key.
When we run workflow manually, all is fine, but if we use node “Schedule trigger” to run any workflow I get an error attached below.

We have set the env variable “N8N_ENCRYPTION_KEY” before the first run.

What is the error message (if any)?

ERROR: UNKNOWN ERROR - check the detailed error for more information
Credentials could not be decrypted. 
The likely reason is that a different "encryptionKey" was used to encrypt the data.

Information on your n8n setup

• n8n version: 0.218.0
• Database you’re using (default: SQLite): PostgreSQL
• Running n8n via [Docker, npm, n8n.cloud, desktop app]: Docker

[Jon]

Hey @Majkel97,

Welcome to the community

Are you running n8n in queue mode? Normally I would only expect to see that if the encryption has changed so it is a bit odd that it works manually.

[Majkel97]

Thanks for your reply.

Yes, we have the executions mode set to queue:
EXECUTIONS_MODE: queue

[Jon]

Hey @Majkel97,

Do you have the encryption key set to the same value for all of the worker instances?

[Majkel97]

Yes, should be the same:

n8n-worker:
    image: n8nio/n8n:0.218.0
    environment:
      N8N_ENCRYPTION_KEY: <key_here> <---
      QUEUE_BULL_REDIS_HOST: redis
      ...
      NODE_ENV: production
    deploy:
      replicas: 2 <----
      placement:
        max_replicas_per_node: 2 <---
    networks:
      - n8n
    command: n8n worker

[Jon]

Hey @Majkel97,

That is odd, It might be worth checking the logs for the workers to see if it is only one of them throwing the message.