There is no timedgoto macro in SugarCube according to it's macro documentation, which is why you are getting that message.
You will need to either remove the timedgoto macro from your story's code and find another way to do what you want, or find someone to create for you a version of Leon's timedgoto macro that works in SugarCube.
Comments
Which Twine 2 story format are you using?
If you put it inside a widget I think it doesn't affect the rest of the page like a raw <<timedcontinue>> does, so you effectively get the same thing.
You will need to either remove the timedgoto macro from your story's code and find another way to do what you want, or find someone to create for you a version of Leon's timedgoto macro that works in SugarCube.