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LPC2148 & USB communication

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supi

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I want to develop mass storage device using LPC2148.I am just referring code from Keil for USBMem. My problem is -
I get Get_descriptor command from PC to which I respond with device descriptor. On receiving 8th byte it generates Reset.
Then I get Set_address command. On response to it, I execute Set Address command in protocol engine.
Then again I get Get_descriptor command (It should actually have index field of 18 but I receive with 64).
Again after 8th byte it generates Reset and again gives Set_address command instead of Get_descriptor command for Configuration descriptor.
What can be the problem?
 

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