`brew cask install --debug gif-brewery2-beta` error

gistfile1.sh-session

$ brew cask install --debug gif-brewery2-beta
==> Initializing Taps
==> Creating directories
==> Loading Cask definitions
==> Translating 'gif-brewery2-beta' into a valid Cask source
==> Testing source class Cask::Source::URI
==> Testing source class Cask::Source::PathSlashRequired
==> Testing source class Cask::Source::TappedQualified
==> Testing source class Cask::Source::UntappedQualified
==> Testing source class Cask::Source::Tapped
==> Success! Using source class Cask::Source::Tapped
==> Resolved Cask URI or file source to '/usr/local/Library/Taps/caskroom/homebrew-versions/Casks/gif-brewery2-beta.rb'
==> Cask instance dumps in YAML:
==> Cask instance toplevel:
--- !ruby/object:GifBrewery2Beta
title: gif-brewery2-beta
==> Cask instance method 'homepage':
--- http://gifbrewery.com
...
==> Cask instance method 'url':
--- !ruby/object:Cask::URL
uri: !ruby/object:URI::HTTP
  scheme: http
  user:
  password:
  host: www.helloresolven.com
  port: 80
  path: /betas/gifbrewery/GIFBrewery-2.3.5-beta1.zip
  query:
  opaque:
  registry:
  fragment:
  parser:
user_agent:
cookies:
referer:
using:
revision:
trust_cert:
data:
==> Cask instance method 'appcast':
---
...
==> Cask instance method 'version':
--- 2.3.5-beta1
...
==> Cask instance method 'license':
--- !ruby/object:Cask::DSL::License
value: :closed
==> Cask instance method 'tags':
---
...
==> Cask instance method 'sums':
---
- !ruby/object:Checksum
  hash_type: :sha2
  hexdigest: 82c5cb4f0ccc81d076358195e54427819a61a581f583458879c99b9f974b6886
==> Cask instance method 'artifacts':
---
:link: !ruby/object:Set
  hash:
    ? - GIF Brewery-2.3.5-beta1.app
    : true
==> Cask instance method 'caveats':
--- []
==> Cask instance method 'depends_on_formula':
--- []
==> Cask instance method 'conflicts_with':
---
...
==> Cask instance method 'container_type':
---
...
==> Cask instance method 'gpg':
---
...
==> Cask::Installer.install
==> Printing caveats
==> Downloading
==> Downloading http://www.helloresolven.com/betas/gifbrewery/GIFBrewery-2.3.5-beta1.zip
==> Calling curl with args ["#<Cask::URL:0x007f8d739a2830 @uri=#<URI::HTTP:0x007f8d739a24c0 URL:http://www.helloresolven.com/betas/gifbrewery/GIFBrewery-2.3.5-beta1.zip>, @user_agent=nil, @cookies=nil, @referer=nil, @using=nil, @revision=nil, @trust_cert=nil, @data=nil>", "-C", "0", "-o", "#<Pathname:/Library/Caches/Homebrew/gif-brewery2-beta-2.3.5-beta1.zip.incomplete>"]
######################################################################## 100.0%
==> Checksums match
==> Downloaded to -> /Library/Caches/Homebrew/gif-brewery2-beta-2.3.5-beta1.zip
==> Extracting primary container
==> Determining which containers to use based on filetype
==> Checking container class Cask::Container::Pkg
==> Checking container class Cask::Container::Ttf
==> Checking container class Cask::Container::Otf
==> Checking container class Cask::Container::Air
==> Checking container class Cask::Container::Cab
==> Executing: ["/usr/bin/file", "-Izb", "--", "#<Pathname:/Library/Caches/Homebrew/gif-brewery2-beta-2.3.5-beta1.zip>"]
==> Checking container class Cask::Container::Dmg
==> Executing: ["/usr/bin/hdiutil", "imageinfo", "#<Pathname:/Library/Caches/Homebrew/gif-brewery2-beta-2.3.5-beta1.zip>"]
==> Checking container class Cask::Container::SevenZip
==> Checking container class Cask::Container::Sit
==> Checking container class Cask::Container::Tar
==> Checking container class Cask::Container::Rar
==> Checking container class Cask::Container::Zip
==> Using container class Cask::Container::Zip for /Library/Caches/Homebrew/gif-brewery2-beta-2.3.5-beta1.zip
==> Executing: ["/usr/bin/ditto", "-xk", "--", "#<Pathname:/Library/Caches/Homebrew/gif-brewery2-beta-2.3.5-beta1.zip>", "#<Pathname:/opt/homebrew-cask/Caskroom/gif-brewery2-beta/2.3.5-beta1>"]
==> Installing artifacts
==> Determining which artifacts are present in Cask gif-brewery2-beta
==> Checking for artifact class Cask::Artifact::BeforeBlock
==> Checking for artifact class Cask::Artifact::NestedContainer
==> Checking for artifact class Cask::Artifact::Installer
==> Checking for artifact class Cask::Artifact::App
==> Checking for artifact class Cask::Artifact::Artifact
==> Checking for artifact class Cask::Artifact::Colorpicker
==> Checking for artifact class Cask::Artifact::Pkg
==> Checking for artifact class Cask::Artifact::Prefpane
==> Checking for artifact class Cask::Artifact::Qlplugin
==> Checking for artifact class Cask::Artifact::Font
==> Checking for artifact class Cask::Artifact::Widget
==> Checking for artifact class Cask::Artifact::Service
==> Checking for artifact class Cask::Artifact::CaskroomOnly
==> Checking for artifact class Cask::Artifact::Binary
==> Checking for artifact class Cask::Artifact::InputMethod
==> Checking for artifact class Cask::Artifact::InternetPlugin
==> Checking for artifact class Cask::Artifact::ScreenSaver
==> Checking for artifact class Cask::Artifact::Uninstall
==> Checking for artifact class Cask::Artifact::AfterBlock
==> Checking for artifact class Cask::Artifact::Zap
==> 2 artifact/s defined
Cask::Artifact::App
Cask::Artifact::Artifact
==> Installing artifact of class Cask::Artifact::App
==> Purging files for version 2.3.5-beta1 of Cask gif-brewery2-beta
Error: It seems the symlink source is not there: '/opt/homebrew-cask/Caskroom/gif-brewery2-beta/2.3.5-beta1/GIF Brewery-2.3.5-beta1.app'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/artifact/symlinked.rb:101:in `preflight_checks'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/artifact/symlinked.rb:62:in `link'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/artifact/symlinked.rb:87:in `block in install_phase'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/artifact/symlinked.rb:87:in `each'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/artifact/symlinked.rb:87:in `install_phase'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/installer.rb:98:in `block in install_artifacts'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/installer.rb:96:in `each'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/installer.rb:96:in `install_artifacts'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/installer.rb:51:in `install'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/cli/install.rb:20:in `block in install_casks'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/cli/install.rb:17:in `each'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/cli/install.rb:17:in `install_casks'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/cli/install.rb:6:in `run'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/cli.rb:81:in `run_command'
/usr/local/Cellar/brew-cask/0.45.0/rubylib/cask/cli.rb:121:in `process'
/usr/local/bin/brew-cask.rb:42:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/usr/local/Library/brew.rb:59:in `require?'
/usr/local/Library/brew.rb:142:in `<main>'