[Bug?] Exception: <== is not in cables

[RubenHeyse]

I'm currently designing a simple wiring harness and encountering an error stating Exception: <== is not in cables when trying to link a simple crimped pin to it's connector. I've been following the arrow syntax in the syntax guide.
The Yaml File is:

connectors:
  X1:
    type: Plug
    pins: [A, B, C, D, E, F, G, H, J, K, L, M, N, P]
    pinlabels: [GND, 12V, J1939+, J1939-]
    pincolors: [BK, RD, YE, GN]
    pincount: 14
    show_pincount: true
    hide_disconnected_pins: true
    notes: |
      Unconnected pins are not shown
      Cavity plugs are to be fitted in unpopulated holes
    image: 
      src: Images/HDP26-18-14SE-CL20.jpg
      height: 150
      caption: "DEUTSCH: HDP26-18-14SE-CL20"
    manufacturer: DEUTSCH
    mpn: HDP26-18-14SE-CL20
    additional_components:
    -
      type: "Cavity Plug"
      qty: 10
      manufacturer: DEUTSCH    
      mpn: 2373921-1

  X2:
    type: Receptacle
    pinlabels: [12V, GND, CAN HI, CAN LO]
    pincolors: [RD, BK, YE, GN]
    image:
      src: Images/DT04-4P-CE03.jpeg
      height: 150
      caption: "DEUTSCH: DT04-4P-CE03"
    manufacturer: DEUTSCH
    mpn: DT04-4P-CE03

  PIN:
    style: simple
    autogenerate: true
    type: Crimped Pin
    manufacturer: DEUTSCH
    mpn: 1060-16-0622

  SOCKET:
    style: simple
    autogenerate: true
    type: Crimped Socket
    manufacturer: DEUTSCH
    mpn: 1062-16-0177


cables:
  W1:
    category: bundle
    gauge: 1 mm2
    length: 500 mm
    colors: [BK, RD, YE, GN]
    show_equiv: true
    mpn: [TW100-B-500, TW100-R-500, TW100-Y-500, TW100-DG-500]
    notes: |
      Red and Black are a twisted pair with 25mm pitch
      Yellow and Green are a twisted pair with 25mm pitch
    additional_components:
    -
      type: Conduit
      subtype: Black Plastic, 12mm
      qty: 470 
      unit: mm
      mpn: CTPA12
    -
      type: Heat Shrink
      subtype: Adhesive Lined
      qty: 2

connections:
  -
    - X1: [A, B, C, D]
    - <==
    - SOCKET.
    - W1: [1, 2, 3, 4]
    - PIN.
    - ==>
    - X2: [2, 1, 3, 4]

Is this down to an installation issue?

[kvid]

@RubenHeyse - Thank you for reporting this error message, but please always provide all information about your set of versions as described in CONTRIBUTING.md and how you installed WireViz and dependencies. Otherwise, it might be hard to help you when nobody knows how to recreate the error you report.

It seems you use a mix of the v0.3.2 syntax (e.g. autogenerate) and v0.4 syntax (e.g. <==) in the same YAML input. Is it possible that you have installed a version of WireViz older than v0.4?