I am facing problem in SD card read write process

Hello
My name is Shashank
I am working on a project which includes SD card interfacing with LPC2368

Up till now I am able to get starting command response successfully i.e for CMD0,CMD55,CMD41

But as I move forward i stuck in SD card Write/Read .

Its giving me Data underrun error.

What is that error

why is it coming

how to solve that

Please Help!

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