> For the complete documentation index, see [llms.txt](https://docs.elentra.org/technical/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.elentra.org/technical/developers/troubleshooting/docker.md).

# Docker

## Session Errors After Upgrading

Problem: You experience errors related to Redis and being unable to read the session data.

![](https://2726126485-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LD7sC1wsETe3sZSW4wd%2F-M9-vVaH6K6xJIzMmvat%2F-M9-xMdQh5nKc-1-oBko%2Fimage.png?alt=media\&token=b55ab887-0661-45a0-96cc-7bec0db3b021)

* Make sure that you have started the docker environment with the `--build` flag by running

  ```
  docker-compose up -d --build
  ```