Collection tree nav error in Emiglio theme in 3.0

I’m Running an Omeka Classic site, version 3.01, on Reclaim.

I use the Collection Tree 2.1 plugin. After the update to Omeka 3.01, and updating Emiglio to 2.42, the theme doesn’t seem to be able to find the arrow image that appears to the right of the menu item to show that there’s a drop down–it’s showing an HTML image error there instead. The drop down itself is working just fine.