Running "grunticon:icons" (grunticon) task freezes the task and throws an error

[robibubble]

Here is my Problem:

$grunt icon

Running "icon" task

Running "clean:icons" (clean) task
>> 1 path cleaned.

Running "svgmin:icons" (svgmin) task
✔ htdocs/frontend/src/icons/input/arrow-down-s.colors-disabled-hover-defaultMb-disabledMb-white-error.svg (saved 209 B 50%)
✔ htdocs/frontend/src/icons/input/arrow-left-narrow.colors-white-hover.svg (saved 208 B 50%)
✔ htdocs/frontend/src/icons/input/arrow-right-narrow.colors-lightGray.svg (saved 209 B 50%)
✔ htdocs/frontend/src/icons/input/arrow-right-xs.colors-defaultMb-white-hover.svg (saved 208 B 49%)
✔ htdocs/frontend/src/icons/input/arrow-up-xs.colors-defaultMb-white-hover.svg (saved 263 B 59%)
✔ htdocs/frontend/src/icons/input/btn-video.svg (saved 268 B 44%)
✔ htdocs/frontend/src/icons/input/check.colors-disabled-hover-defaultMb-disabledMb.svg (saved 339 B 56%)
✔ htdocs/frontend/src/icons/input/close.colors-white-disabled-hover-defaultMb-disabledMb.svg (saved 219 B 46%)
✔ htdocs/frontend/src/icons/input/close.svg (saved 235 B 48%)
✔ htdocs/frontend/src/icons/input/download.svg (saved 324 B 55%)
✔ htdocs/frontend/src/icons/input/kununu.colors-white-disabled.svg (saved 1.21 kB 36%)
✔ htdocs/frontend/src/icons/input/loupe.colors-defaultMb-hover.svg (saved 210 B 35%)
✔ htdocs/frontend/src/icons/input/menu.colors-defaultMb-white-hover.svg (saved 263 B 56%)
✔ htdocs/frontend/src/icons/input/page-left-mobile.svg (saved 208 B 50%)
✔ htdocs/frontend/src/icons/input/page-left.colors-hover.svg (saved 215 B 48%)
✔ htdocs/frontend/src/icons/input/page-left.svg (saved 215 B 48%)
✔ htdocs/frontend/src/icons/input/page-right-mobile.colors-disabledMb-hover-white.svg (saved 209 B 51%)
✔ htdocs/frontend/src/icons/input/page-right-mobile.svg (saved 209 B 51%)
✔ htdocs/frontend/src/icons/input/page-right.colors-hover.svg (saved 212 B 48%)
✔ htdocs/frontend/src/icons/input/page-right.svg (saved 212 B 48%)
✔ htdocs/frontend/src/icons/input/page-slash-mobile.svg (saved 257 B 53%)
✔ htdocs/frontend/src/icons/input/page-slash.svg (saved 211 B 50%)
✔ htdocs/frontend/src/icons/input/rss.colors-white-disabled.svg (saved 151 B 31%)
✔ htdocs/frontend/src/icons/input/todo.svg (saved 133 B 40%)
✔ htdocs/frontend/src/icons/input/xing.colors-white-disabled.svg (saved 1.37 kB 43%)
Total saved: 7.77 kB

Running "grunticon:icons" (grunticon) task
Error: Command failed: /Users/user/Development/foo/bar/node_modules/grunt-grunticon/node_modules/grunticon-lib/node_modules/directory-colorfy/node_modules/phantomjs/lib/phantom/bin/phantomjs /Users/user/Development/foo/bar/node_modules/grunt-grunticon/node_modules/grunticon-lib/node_modules/directory-colorfy/lib/phantomscript.js %3C?xml%20version=%221.0%22%20encoding=%22utf-8%22?%3E%3Csvg%20version=%221.2%22%20baseProfile=%22tiny%22%20xmlns=%22http://www.w3.org/2000/svg%22%20width=%2215%22%20height=%2210.7%22%20viewBox=%220%200%2015%2010.7%22%3E%3Cpath%20d=%22M.01%205.875l.566-.566%204.88%204.878-.567.566zM14.457.044l.566.566L4.84%2010.792l-.565-.566z%22/%3E%3C/svg%3E check-disabled.svg #c7c7c7

    at ChildProcess.exithandler (child_process.js:213:12)
    at emitTwo (events.js:87:13)
    at ChildProcess.emit (events.js:172:7)
    at maybeClose (internal/child_process.js:821:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:211:5)

Here are my Versions

$ phantomjs --version
2.1.1
$ npm --version
2.14.12
$  node --version
v4.2.6

My only assumption why this could happen is because of permission issues, does anyone have any other idea ?