You can not make any folder named any of the following :

CON, PRN, AUX, CLOCK$, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, LPT9

And many more…

Reason :

This is because these are windows inbuilt ‘Reserved Device Names’ .

Just avoid these words and name anything else !

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