Error 'could not find function "Key<-"' when using docker

[qianxuans]

Hi,
I followed the introduction of running the app using Docker.
In which I git clone the repo and use "docker build -t azimuth ." to create the docker image.
I also followed the step of "docker run -it -p 3838:3838 -v /path/to/reference:/reference-data:ro azimuth" to mount the reference to the container.
However, when I open the webpage of the app, this error appeared and the webpage turned grey.

> Azimuth::AzimuthApp(reference='/reference-data')
Registered S3 method overwritten by 'SeuratDisk':
  method            from  
  as.sparse.H5Group Seurat

Attaching shinyBS
Loading required package: shiny

Listening on http://0.0.0.0:3838
Warning: Overwriting miscellanous data for model
Warning: Adding a dimensional reduction (refUMAP) without the associated assay being present
Warning: Error in <-: could not find function "Key<-"
  47: GetPlotRef.AzimuthData
  45: LoadReference
  41: server
   4: runApp
   1: Azimuth::AzimuthApp
Error in Key(plotref) <- gsub("\\.", "", Key(plotref)) : 
  could not find function "Key<-"

Any idea how to fix this? Thank you so much!!