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Why does D3DXComputeBoundingBox keep crashing?

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Hi im using D3DXComputeBoundingBox, but it keeps crashing, and i can't work out what im doing wrong.
struct VERTEX{
   D3DXVECTOR3 pos;
   D3DXVECTOR3 norm;
   float tu;
   float tv;

VERTEX *pVerts;

if(SUCCEEDED(sphere->LockVertexBuffer(0, (void**)&pVerts))) {
	int numVerts=sphere->GetNumVertices();
	D3DXVECTOR3 vMin,vMax;
      //crashes here
	D3DXComputeBoundingBox((const D3DXVECTOR3*)pVerts,numVerts,D3DFVF_XYZ|D3DFVF_NORMAL|D3DFVF_TEX1,&vMin,&vMax));

I've looked at multiple sources of code and they all are doing the same thing as me, but mine crashes.. What could I be possibly be doing wrong here? Thx!

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