Here is a deep write-up on what these labels mean, why they appear, and how to resolve issues related to them. What is CIDFont+F1?

If your document is showing these errors, try these common workarounds:

Modern designers sometimes use Ero , a variable typeface designed by Monotype Studios to evoke the speed and grit of motorsport. CID+ Fonts - Adobe Community

Many users on the Adobe Community suggest opening the file in a basic viewer like macOS Preview and then using File > Export as PDF to "re-bake" the document and fix the encoding.