Exception when building MsSqlTestContainer

[siguro58]

When instantiating TestcontainersBuilder like this:
var builder = new TestcontainersBuilder<MsSqlTestcontainer>()

this exception is thrown:

System.TypeInitializationException: 'The type initializer for 'DotNet.Testcontainers.Configurations.TestcontainersSettings' threw an exception.'
Inner exception
InvalidOperationException: Sequence contains no elements

Below is an excerpt of the stack trace:

at DotNet.Testcontainers.Configurations.TestcontainersSettings.get_OS()
at DotNet.Testcontainers.Builders.TestcontainersBuilder`1..ctor()

The code is built with .net core 6
Any idea what is causing the exception?

[siguro58]

Found the answer, setting the DOCKER_HOST environment variable worked.

[siguro58]

Except now I get an error when executing builder.Build(): Image can not be null. (Parameter 'Image')
Tried setting the image with builder.WithImage("mcr.microsoft.com/mssql/server:2017-CU28-ubuntu-16.04")
but get the same error

[HofmeisterAn]

Which Docker engine do you use? Can you add the docker info output?