CircleCI config question

[ChameleonTartu]

Hi, @serhiiKalchenko I found your repo when I tried resolving my own Circle CI issue.

I see that you have several executors. I am trying to do the same but through Circle CI orb.

I always get the same error:

#!/bin/sh -eo pipefail
# Error calling workflow: 'release-build'
# Error calling job: 'cloudwheel-lowell/maven-build-release'
# Cannot find a definition for executor named linux
# 
# -------
# Warning: This configuration was auto-generated to show you the message above.
# Don't rerun this job. Rerunning will have no effect.
false

Did you experience anything similar? I am looking in the CircleCI docs, StackOverflow, Reddit, and GitHub but so far no luck.