Issues when signing OTA package

[ttimasdf]

Hi,
I am using your manifest for oneplus3 to build the rom myself(for fixing KRACK 😄). When signing the package generated by mka target-files-package dist, I encountered an error

ERROR: no key specified for:

  QtiTetherService.apk
  Updater.apk
  dpmserviceapp.apk

Use '-e <apkname>=' to specify a key (which may be an
empty string to not sign this apk).

I know I'm able to add an parameter to circumvent this error but I wonder if this is normal?