Why objects render black even when a texture is applied in blender? - rendering

I created several objects ,applied its material with texture .But still when I render the scene all render nicely except one.It renders black both in cycles and BI.I have tried everything .I don't know whether I have missed something or not But I'm not getting the result properly.What is the solution to this 'rendering black' problem ?
Please help
Thanks in advance!
Cheers

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