This is a really simple question, and it\'s probably a setting somewhere I don\'t know about, but Google is being particularly unhelpful for this question, giving results ab
Perhaps you should check your IDE case sensitive properties.
I had the same problem, and solved it by making Idea case-sensitive (for my filesystem is case sensitive):
https://confluence.jetbrains.com/display/IDEADEV/Filesystem+Case-Sensitivity+Mismatch