Why creation of VertexShader fails in my application!

The most probable reason maybe that the device created by your application is using hardware vertex processing, but the display adaptor or driver does not support the programmable vertex shader execution in hardware, or does not implement the version of vertex shader code required by your shader.

Check if your 3D card is DirectX9 Compliant and even if it is not fully compliant check whether it at least support VS_1.0 (Vertex Shader 1.0).

When evaluating devices that use hardware vertex processing check for vertex shader support. If you are using the D3DApp framework, then for a vertex shader1.0 support add the following to the ConfirmDevice ()

if( (dwBehavior & D3DCREATE_HARDWARE_VERTEXPROCESSING ) ||
    (dwBehavior & D3DCREATE_MIXED_VERTEXPROCESSING ) )
{
    if( pCaps->VertexShaderVersion < D3DVS_VERSION(1,0) )
        return E_FAIL;
}

If your device is using software vertex processing then there is no need to perform this check as shader support is guaranteed through emulation (However it maybe damn slow!)

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