Added a new pod target to a very old project. got that error.
heres my steps that worked.
I had to uninstall cocoapods completely
it removed about 5 old versions
and wiped the whole workspace file
sudo gem uninstall cocoapods --all
sudo gem install cocoapods
//delete Derived Data - you could try just deleting the folder for your project but project only built when I wiped it all
rm -rf ~/Library/Developer/Xcode/DerivedData/
rm -rf ~/Library/Caches/CocoaPods/
pod deintegrate
//delete the *.workspace file
pod update
open workspace
clearbrian
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just happened to me in london 11:35 BST London. UK
Add user > Shows error with no info.
no Pending user setup on the dev portal.
User got the email. clicked on it but said no apps appeared.
I added them as Customer Service first with one app thats in beta testing internally so not released yet..got error.
Tried again with admin and all apps ..same unhelpful error.