Error Message during Linphone Flatpak Installation

what do I have to do if I get this error message while executing the command:

flatpak --user install --from https://linphone.org/flatpak/linphone.flatpakref


The Application com.belledonnecommunications.linphone/x86_64/4.1.1 requires the org.freedesktop.Platform/x86_64/1.6 which was not found

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