Google never fails
That error code is not undefined. Simply looking it up in DirectX Error Lookup shows:

HRESULT: 0x88760b59 (2289437529)
Name: D3DXERR_INVALIDDATA
Description: Invalid data
Severity code: Failed
Facility Code: FACILITY_D3D (2166)
Error Code: 0x0b59 (2905)

Such an error is usually accompanied by a helpful message from D3DX in the debug output window. Make sure you link against the debug version of D3DX first, and watch what is logged to the output window right as you step over that function.