can't explain why I am getting this warning

Trying to create an online installer, but I get a warning saying:

Warning: The following explicitly given packages could not be found
in package directory: ("XXXXXXXXXXXXXXXXX_online_XXXXXXXXXXXXXXXXX") (../common/repositorygen.cpp:451, QInstallerTools::PackageInfoVector QInstallerTools::createListOfPackages(const QStringList&, QStringList*, QInstallerTools::FilterType))

I'm using the following command:
binarycreator -c config/config.xml -p packages/ --online-only sirius_installer

I tried the "n" flag, as well as not giving it any packages, since an online installer wouldn't need this info, but binarycreator requires a -p dir/ argument. I currently have some issues with authenticating root priviledges, so I don't know if this warning is causing any issues.

From the source code, I don't really know how a "packagestofilter" list is even specified:

if (!packagesToFilter->isEmpty())

{ qWarning() << "The following explicitly given packages could not be found\n in package directory:" << *packagesToFilter; }

Thanks for any help