How to fix broken Paragraph Styles

[defaultcoozzc7per4v]

Hello, I was using Indesign nromally during the last 4 months and everything was going fine. However, today all of a sudden some Paragraph styles I was using changed into Text and I can't use them. Some of them were also highlighted by a light red colour and I don't know what's wrong with it. Any ideas on what's the problem?

[Eugene Tyson]

Highlight of light red or pink means the font is missing.

Have you got the font installed? 

Can you share some screenshots?