File was loaded in the wrong encoding:'UTF-8' in IntelliJ IDEA

Question

Before asking the question, I searched for a similar question on StackOverflow:

file was loaded in the wrong encoding: 'UTF-8' in android studio

But

Answer 1

Click on setting symbol just right side of error and select suppress for class. That works for me and resolve my issue.

Answer 2

I tried all possibilities posted here but any success with them, what worked was just to re import the project

Answer 3

Simply just delete the IDE's Settings Directory,

See the answer here: file was loaded in the wrong encoding: 'UTF-8' in the Android Studio