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If you are seeing these errors in a document, you can usually resolve them by substituting the placeholders with standard fonts: CID+ Fonts - Adobe Community
If you are trying to view a PDF and it says "CID Font F1 not found," it means the PDF was created without embedding the font properly, and your computer is trying to find a match but failing. Cid Font F1 F2 F3 F4 Free Download
and then exporting it again as a PDF, which can sometimes "re-bake" the fonts into a readable format. Identify and Replace : Use the "File Properties" (Ctrl+D) in Adobe Acrobat If you are seeing these errors in a