Duplicate menu entry using hugo 0.115.1 w/ two languages

I cannot rebuild hugo successfully.

vscode ➜ /workspaces/omis_docs_07_23/docs (master) $ hugo -v --cacheDir ~/.local/hugo/rmp-4
WARN  --verbose is deprecated and will be removed in a future release. use --logLevel info
hugo: downloading modules …
hugo: collected modules in 47518 ms
Start building sites … 
hugo v0.115.1-857374e69358f788bd31ddc55255c5c8e3dcfd80+extended linux/amd64 BuildDate=2023-07-03T17:28:25Z VendorInfo=gohugoio

INFO  copy static: syncing static files to /
INFO  build: running step process duration 13.535899281s
INFO  build: running step assemble duration 5.618279033s
WARN  .Path when the page is backed by a file is deprecated and will be removed in a future release. We plan to use Path for a canonical source path and you probably want to check the source is a file. To get the current behaviour, you can use a construct similar to the one below:

  {{ $path := "" }}
  {{ with .File }}
        {{ $path = .Path }}
  {{ else }}
        {{ $path = .Path }}
  {{ end }}
WARN  .File.UniqueID on zero object. Wrap it in if or with: {{ with .File }}{{ .UniqueID }}{{ end }}
WARN  "/workspaces/omis_docs_07_23/docs/content/en/_index.md:1:1": duplicate menu entry with identifier "Welcome" in menu "main"
WARN  "/workspaces/omis_docs_07_23/docs/content/en/docs/_index.md:1:1": duplicate menu entry with identifier "docs" in menu "main"
WARN  "/workspaces/omis_docs_07_23/docs/content/en/Whats New/_index.md:1:1": duplicate menu entry with identifier "Whats-New" in menu "main"
INFO  build: running step render duration 8.765808646s
INFO  build: running step postProcess duration 29.602µs
Total in 90184 ms
Error: error building site: TOCSS: failed to transform "scss/main.scss" (text/x-scss): "/workspaces/omis_docs_07_23/docs/themes/Docsy/assets/scss/_colors.scss:4:18": argument `$color2` of `mix($color1, $color2, $weight: 50%)` must be a color

hugo.toml is:

baseURL = "docs/"
title = "omis documentation"

theme = ['Docsy', 'hugo-shortcode-roneo-collection']

# https://www.docsy.dev/docs/adding-content/navigation/#adding-icons-to-the-top-level-menu
# As well as the completely expanded and compact menu options, 
# you can also create a foldable menu by setting the site parameter 

ui.sidebar_menu_foldable = true

# Language settings
contentDir = "content/en"
# defaultContentLanguage = "en"
defaultContentLanguageInSubdir = true
# Useful when translating.
enableMissingTranslationPlaceholders = true

enableRobotsTXT = false

# Will give values to .Lastmod etc.
enableGitInfo = true

# Comment out to enable taxonomies in Docsy
# disableKinds = ["taxonomy", "taxonomyTerm"]

# You can add your own taxonomies
tag = "tags"
category = "categories"

# set taxonomyCloud = [] to hide taxonomy clouds
taxonomyCloud = ["tags", "categories"]

# If used, must have same length as taxonomyCloud
taxonomyCloudTitle = ["Tag Cloud", "Categories"]

# set taxonomyPageHeader = [] to hide taxonomies on the page headers
taxonomyPageHeader = ["tags", "categories"]

# Highlighting config
pygmentsCodeFences = true
pygmentsUseClasses = false
# Use the new Chroma Go highlighter in Hugo.
pygmentsUseClassic = false
#pygmentsOptions = "linenos=table"
# See https://help.farbox.com/pygments.html
pygmentsStyle = "tango"

# Configure how URLs look like per section.
blog = "/:section/:year/:month/:day/:slug/"

# Image processing configuration.
resampleFilter = "CatmullRom"
quality = 75
anchor = "smart"

# Comment out the next line to disable GA tracking. Also disables the feature described in [params.ui.feedback].
# id = "UA-00000000-0"

# Language configuration

languageName ="English"
# Weight used for sorting.
weight = 1
title = "omis docs"
description = "omis Documentation"

languageName ="Deutsch"
contentDir = "content/de"
title = "omis docs"
description = "omis Dokumentation"
time_format_default = "02.01.2006"
time_format_blog = "02.01.2006"

      block = true
      unsafe = true
    # See a complete list of available styles at https://xyproto.github.io/splash/docs/all.html
    style = "rainbow_dash"
    # Uncomment if you want your chosen highlight style used for code blocks without a specified language
    guessSyntax = "true"

# Everything below this are Site Params

# Comment out if you don't want the "print entire section" link enabled.
# [outputs]
# section = ["HTML", "print", "RSS"]

copyright = "Example GmbH"
privacy_policy = "https://www.example.com/en/Privacy_policy_en.html"

# First one is picked as the Twitter card image if not set on page.
# images = ["images/project-illustration.png"]

# Menu title if your navbar has a versions selector to access old versions of your site.
# This menu appears only if you have at least one [params.versions] set.
version_menu = "Releases"

# Flag used in the "version-banner" partial to decide whether to display a
# banner on every page indicating that this is an archived version of the docs.
# Set this flag to "true" if you want to display the banner.
archived_version = false

# The version number for the version of the docs represented in this doc set.
# Used in the "version-banner" partial to display a version number for the
# current doc set.
version = "4.0"

# A link to latest version of the docs. Used in the "version-banner" partial to
# point people to the main doc site.
url_latest_version = "https://pages.example.com/docs"

# Repository configuration (URLs for in-page links to opening issues and suggesting changes)
# github_repo = "https://support.omis.at/"
# An optional link to a related project repo. For example, the sibling repository where your product code lives.
# github_project_repo = "https://github.com/google/docsy"

# Specify a value here if your content directory is not in your repo's root directory
# github_subdir = "omis_docs_07_23"

# Uncomment this if your GitHub repo does not have "main" as the default branch,
# or specify a new value if you want to reference another branch in your GitHub links
github_branch= "main"

# Google Custom Search Engine ID. Remove or comment out to disable search.
# gcs_engine_id = "xxxx1111122222333333"

# Enable Algolia DocSearch
algolia_docsearch = false

# Enable Lunr.js offline search
offlineSearch = true
offlineSearchSummaryLength = 200

# Enable syntax highlighting and copy buttons on code blocks with Prism
prism_syntax_highlighting = false

# User interface configuration
#  Set to true to disable breadcrumb navigation.
breadcrumb_disable = false
# Set to true to disable the About link in the site footer
footer_about_disable = false
# Set to false if you don't want to display a logo (/assets/icons/logo.svg) in the top navbar
navbar_logo = true
# Set to true if you don't want the top navbar to be translucent when over a `block/cover`, like on the homepage.
navbar_translucent_over_cover_disable = false
# Enable to show the side bar menu in its compact state.
sidebar_menu_compact = true
# Set to true to hide the sidebar search box (the top nav search box will still be displayed if search is enabled)
sidebar_search_disable = false

# Adds a H2 section titled "Feedback" to the bottom of each doc. The responses are sent to Google Analytics as events.
# This feature depends on [services.googleAnalytics] and will be disabled if "services.googleAnalytics.id" is not set.
# If you want this feature, but occasionally need to remove the "Feedback" section from a single page,
# add "hide_feedback: true" to the page's front matter.
enable = false
# The responses that the user sees after clicking "yes" (the page was helpful) or "no" (the page was not helpful).
yes = 'Glad to hear it! Please <a href="mailto:office@example.com?subject=Positive%20Feedback%20from%20doc%20omis">let us know how we are doing!</a>.'
no = 'Sorry to hear that. Please <a href="mailto:office@example.com?subject=Constructive%20Feedback%20from%20doc%20omis">tell us how we can improve</a>.'

# Adds a reading time to the top of each doc.
# If you want this feature, but occasionally need to remove the Reading time from a single page,
# add "hide_readingtime: true" to the page's front matter
enable = true

timeout = "10m"

# End user relevant links. These will show up on left side of footer and in the community page if you have one.
  name = "Contact us!"
  url = "https://www.omis.at/en/Contact-en.html"
  icon = "fa fa-envelope"
  desc = "Discussion and help from your fellow users"
  name ="Instagram"
  url = "https://www.instagram.com/omis4.0/"
  icon = "fab fa-instagram"
  desc = "Follow us on Instagram to get the latest news!"
  name = "Linkedin"
  url = "https://at.linkedin.com/company/omis-gmbh"
  icon = "fab fa-linkedin-in"
  desc = "Practical questions and curated answers"

version_menu = "Releases"

  version = "master"
  url = "http://localhost:1313/"

  version = "v1.23.0"
  url = "https://pages.example.com/docs"

  version = "v1.23.4"
  url = "https://www.example.comt/"

# Developer relevant links. These will show up on right side of footer and in the community page if you have one.
# [[params.links.developer]]
#  name = "Gitlab"
#  url = "https://github.com/google/docsy"
#  icon = "fab fa-github"
#  desc = "Development takes place here!"

#  name = "Slack"
#  url = "https://example.org/slack"
#  icon = "fab fa-slack"
#  desc = "Chat with other project developers"
#  name = "Developer mailing list"
#  url = "https://example.org/mail"
#  icon = "fa fa-envelope"
#  desc = "Discuss development issues around the project"

# hugo module configuration

  # uncomment line below for temporary local development of module
  # replacements = "github.com/google/docsy -> ../../docsy"
    extended = true
    min = "0.115.3"
    path = "github.com/google/docsy"
    disable = false
    path = "github.com/google/docsy/dependencies"
    disable = false
    #path = "github.com/RoneoOrg/hugo-shortcode-roneo-collection"
    #disable = false

I believe copying packages.json from the docsy theme and running git submodule update --init --recursive resolved these errors. Now new things are failing which may or may not be related.
New issues occuring warrant a separate post. See current state of my messed up Hugo project here