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Usb Hosting Error on STM32F429

Hello Everyone,
I'm following these steps ( www2.keil.com/.../ ) in order to understand USB Hosting and create my own application. Unfortunately i encountered a problem. I arrived at Step 3 and i added the Host support correctly but i can't access the usb stick. When i debug the USBH_MSC_DriveMount function , i found that wether the actual usb stick is connected or not , the finit function returns fsDriverError. I checked on Documentation and found out that it means it failed to initialize the drive but i couldn't find a way how to fix it or what it actually means.
I'll be glad if you could help me solve my problem and thank you .

I'm using STM32F429