Error with 'undefined' node or PROTO in Webots R2023a

[abdul-mannan-khan]

Hello Cyberbotics team,

I am currently encountering an issue with using certain PROTO files in Webots R2023a. The error messages I'm receiving indicate a problem with 'undefined' nodes or PROTOs and unknown base types. These errors occur with several PROTO files from the Webots library.

The specific error messages I'm encountering are as follows:

ERROR: Missing declaration for 'undefined', unknown node.
ERROR: Skipped unknown 'undefined' node or PROTO in several PROTO files including TexturedBackground.proto, TexturedBackgroundLight.proto, Parquetry.proto, Floor.proto, and SimpleBuilding.proto.

I'm using a simple file with EXTERNPROTO declarations as shown below:

#VRML_SIM R2023a utf8
EXTERNPROTO "https://raw.githubusercontent.com/cyberbotics/webots/R2023a/projects/objects/backgrounds/protos/TexturedBackground.proto"
EXTERNPROTO "https://raw.githubusercontent.com/cyberbotics/webots/R2023a/projects/objects/backgrounds/protos/TexturedBackgroundLight.proto"
EXTERNPROTO "https://raw.githubusercontent.com/cyberbotics/webots/R2023a/projects/objects/floors/protos/Floor.proto"
EXTERNPROTO "https://raw.githubusercontent.com/cyberbotics/webots/R2023a/projects/appearances/protos/Parquetry.proto"
EXTERNPROTO "https://raw.githubusercontent.com/cyberbotics/webots/R2023a/projects/objects/buildings/protos/SimpleBuilding.proto"
EXTERNPROTO "https://cyberbotics.com/doc/protos/Sensors/BumperSensor.proto"

Could you please help me understand the cause of these errors and suggest a solution? I am using Webots R2023a and have not made any significant changes to the base setup.

Thank you for your assistance!

[patham9]

Same issue here, their Wiki is unfortunately outdated, so the Wiki in
https://docs.ros.org/en/foxy/Tutorials/Advanced/Simulators/Webots/Installation-MacOS.html
cannot be followed and the examples in
https://github.com/cyberbotics/webots_ros2/wiki/Example-TIAGo
cannot be used without non-trivial changes which have yet to be figured out.