LinearMap : error while running LinearMap

Please try to avoid posting screenshots and quote your code instead, as this makes it much easier to help you. Also try to make sure, you provide a complete working example, as you didn’t define multiplyHPsi anywhere. This thread may be helpful to you:

That said, does your code work on a previous version of Julia? What version of LinearMaps.jl are you using? (You can find that out with ]st LinearMaps in the REPL.)

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