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  • Filesystem Case-Sensitivity Mismatch

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All IDEs based on IntelliJ platform have a global setting which tells telling whether to treat file systems as case-sensitive. The setting depends on OS - : by default, Mac OS X and Windows are deemed as having case-insensitive file systems, Linux and friends - are case-sensitive.

Unfortunately, life is never that simple. The warning you've seen means that on opening a project an IDE has performed a quick check and found you guilty that case-sensitivity of a file system, on which the project is located, doesn't match aforementioned setting.