unknown control type - why does this appear and how to get rid of it?

In "Timeline" module, when using add content box for "Update" (here is labeled: short box) a line saying "unknown control type" shows up with an "X" mark on the. right (as shown in attached image). What is that and how can we get rid of it?

image_transcoder.php?o=sys_images_editor&h=851&dpx=2&t=1671024994

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