vDSP.DiscreteFourierTransform failed to initialize with 5 * 5 * 2^n count

I am implementing the FFT using vDSP.DiscreteFourierTransform. According to the official documentation, the count parameter has requirements as outlined below:

/// The `count` parameter must be:
/// * For split-complex real-to-complex: `2ⁿ` or `f * 2ⁿ`, where `f` is `3`, `5`, or `15` and `n >= 4`.
/// * For split-complex complex-to-complex: `2ⁿ` or `f * 2ⁿ`, where `f` is `3`, `5`, or `15` and `n >= 3`.
/// * For interleaved: `f * 2ⁿ`, where `f` is `2`, `3`, `5`, `3x3`, `3x5`, or `5x5`, and `n>=2`.

Despite adhering to these specifications in theory, my attempt to initialize an interleaved DFT with count = 2 * 2 * 5 * 5 (equivalent to 5×5 × 2²) resulted in a failure. Below is the code snippet I used for the initialization:

do {
    let dft = try vDSP.DiscreteFourierTransform(
        previous: nil,
        count: 2 * 2 * 5 * 5,
        direction: .forward,
        transformType: .complexReal,
        ofType: DSPComplex.self
    )
    print(dft)
} catch {
    print("DFT init failed:", error)
}

Could somebody more knowledgeable with these APIs have a look? Thanks!

vDSP.DiscreteFourierTransform failed to initialize with 5 * 5 * 2^n count
 
 
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