Unknown color alert in Illustrator

[rcweburg]

When I open any Illustrator file I get the alert below. How can I fix the problem?

 

[John T Smith]

You need to ask program questions in the forum for the program you are using
To ask in the forum for your program please start at https://community.adobe.com/
Moving from Using the Community (which is about the forums) to the correct forum

[Monika Gause]

Please check out: https://youtu.be/8D4tHrlsA7A?si=FQrGSUVJfjcjdDYV