Based on your screen cap, you have the cert/prov pairing manually selected.
However, you have selected the Distro provision and the Development certificate.:
This why the log states: UATHelper: Packaging (iOS): env: Provisioning profile “RFTDevelopmentAdhoc” doesn’t include signing certificate “iPhone Developer: Vasco Wollschlaeger (YXA4Y4RPEM)”.
It just appears you had bad naming convention when creating the provision.
If you don’t manually pair these, it will select the correct pairing.
During the 4.13.0 release, there was a pairing bug (UE-35316) which was fixed for the hotfix (4.13.1).
Try not manually pairing these (uncheck all boxes) and if it fails to package, try creating a new Certificate and Provision pair with less confusing name conventions.
“RFT Development Adhoc…Distro_RFT Development Adhoc.mobileprovision”
NOTE: you can only use Adhoc. mobile provisions with distribution ceritficates, not development