I upgraded from
swift 2.3 to swift 3.0
projectA to projectB
/Users/name/Desktop/projectA/projectB/Assets.xcassets/Imagesemail@example.com is missing from working copy
I was able to solve this after a lot of research.
I went to
projectB.xcodeproject > Show package contents > project.pbxproj > xcuserdata. Delete the xcuserdata.
Then go to
Source Control > Commit
Commit all changes. Since the path doesn't exist, Xcode will not commit changes; so just cancel out of it and do
Source Control > Refresh Status
Then exit out of Xcode and restart it.