Presumably you get the message when you press Generate & Play in the BiaB program? You didn't say what you did to get this message.

Could you please clarify the steps that lead up to the 'Cannot Play' message?

What is your output devices set to?

For example, are you using ASIO or MME?
Are you using a VSTi/DXi synth such as ForteDXi?

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BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.