Actually his main issue is that he is loading from a coding repository and has not pushed his repository path into the $LOAD_PATH array …
The following script can be named: "_load_from_vscode.rb"
# Put this rb file into SketchUp's "Plugins" folder.
# define a path to your vscode projects:
vscode = "C:/Users/Robson/Documents/workspace-vscode"
# Now push any code repo path you are working on into $LOAD_PATH:
repo = "sketchup-ruby/mobnamico-sketchup/src/"
$LOAD_PATH << File.join(vscode,repo)
Sketchup.require("mobnamico")