Xcodeproj doesn't know about the following attributes {"fileEncoding"=>"4"} for the 'PBXGroup' isa.

This seems to occur since Xcode 8.0.

/usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:321:in `configure_with_plist': [!] Xcodeproj doesn't know about the following attributes {"fileEncoding"=>"4"} for the 'PBXGroup' isa. (RuntimeError)
If this attribute was generated by Xcode please file an issue: https://github.com/CocoaPods/Xcodeproj/issues/new
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project.rb:261:in `new_from_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:350:in `object_with_uuid'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:300:in `block (2 levels) in configure_with_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:299:in `each'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:299:in `block in configure_with_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:296:in `each'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:296:in `configure_with_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project.rb:261:in `new_from_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:350:in `object_with_uuid'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:300:in `block (2 levels) in configure_with_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:299:in `each'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:299:in `block in configure_with_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:296:in `each'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:296:in `configure_with_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project.rb:261:in `new_from_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:350:in `object_with_uuid'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:290:in `block in configure_with_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:287:in `each'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project/object.rb:287:in `configure_with_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project.rb:261:in `new_from_plist'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project.rb:202:in `initialize_from_file'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/project.rb:102:in `open'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/command.rb:59:in `xcodeproj'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/lib/xcodeproj/command/show.rb:46:in `run'
from /usr/local/lib/ruby/gems/2.4.0/gems/claide-1.0.2/lib/claide/command.rb:334:in `run'
from /usr/local/lib/ruby/gems/2.4.0/gems/xcodeproj-1.5.0/bin/xcodeproj:10:in `'
from /usr/local/bin/xcodeproj:22:in `load'
from /usr/local/bin/xcodeproj:22:in `'