Raster (tiff) layer error

[Beemo-afk]

Hi all,

I'm trying to get a raster as a Geotiff into my implementation. However, I keep getting an 'internal server error'.
I've tried the examples from the tutorial (link here) and from the documentation - and all return the same issue.

I'm using the latest docker image to build the implementation - and for testing have only modified the config file to try use the geotiff.

An extract of the config file is below:

    myRaster:
        type: collection
        title: Test raster  
        description: Test raster (.tiff)  
        providers:
          - type: coverage
            name: rasterio
            data: "/src/test.tiff"
            format:
                name: GTiff
                mimetype: application/tiff

I see that another question was asked (link here) - and appeared to have worked in the end... so can someone help identify my issue here?