Ver. 4.6.5 Objective-c Classic: Undefined symbols for architecture arm64 error

Dear staff,

I'm trying to include RadaeePDF (RadaeePDF Classic SDK for iOS 4.6.5, Objective-C) following the doc "RadaeePDF SDK for iOS - v 4.x" - ver 1.1 - last update 08/Apr/2021.
But unfortunately I'm encountering the error below.
Can you help me?
Thanks

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_RDPDFCanvas", referenced from:
      objc-class-ref in AMGPDFReaderViewController.o
  "_OBJC_CLASS_$_PDFLayoutView", referenced from:
      objc-class-ref in AMGPDFReaderViewController.o
  "_OBJC_CLASS_$_RDPDFDoc", referenced from:
      objc-class-ref in AMGPDFReaderViewController.o
      objc-class-ref in AMGPDFUtilities.o
  "_OBJC_CLASS_$_RDVGlobal", referenced from:
      objc-class-ref in AMGPDFReaderViewController.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Hi,
may you check "PDFLayout" dir is included in your project?
and also check build options same to demo project.