How to solve this problem?
Click the OK button to the right.
Yes, it is help for me. But this problem will be remind me everytime when I opened the script. How to solve this problem that not reminded me more…)
Save the file - you won’t be prompted again for it!
If you’re switching between different editors, and tired of it, you can change the policy to whatever you want (see this topic):
http://answers.unity3d.com/questions/424631/monodevelop-line-ending-settings-ignored.html
But in general, I’d just suggest to ignore it.