StandardFirmataBLE Example code Error with ItsyBitsy nRF52840 Express

I am trying to use Bitsyitsy nRF52840(Microcontroller) to send data to Bluefruit Connect by BLE. I tried to implement a sketch example provided by Arduino but I got an error with it. I didn't change the content of the example. Does anyone know what's wrong with this example? Is something missing?

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