Traceback (most recent call last):
  File "./build/tools/releasetools/ota_from_target_files", line 1133, in <module>
    main(sys.argv[1:])
  File "./build/tools/releasetools/ota_from_target_files", line 1101, in main
    WriteFullOTAPackage(input_zip, output_zip)
  File "./build/tools/releasetools/ota_from_target_files", line 526, in WriteFullOTAPackage
    script.ValidateSignatures("data")
AttributeError: 'EdifyGenerator' object has no attribute 'ValidateSignatures'