How do I make a text box that has a typing animation?

I watched a tutorial on how to do it, but for whatever reason, it just refuses to work. If anyone can see something I did wrong or another method for me to use it would be greatly appreciated.

Tutorial I watched: youtube.com/watch

My Code:+ System: Every 0.07 seconds + System: len(Text.Text) > len(SpriteFont.Text) -> SpriteFont: Set text to left(Text.Text, len(SpriteFont.Text) + 1)

dropbox.com/s/s51y2dznggs7b1f/worksfineforme.c3p

The text plugins already have a typewriter action. Unless you wanna do some specific custom stuff it should cover you for the most part.