Can't set up casperjs

[Toto Briac]

Hello, I tried to install casperjs on my raspberrry pi following this tutorial :

http://blog.daviddemartini.com/installing-casperjs-on-raspberry-pi/

Everything worked fine but as I execute:

$ casperjs

I have this error :

qt5ct: using qt5ct plugin
CasperJS version 1.1.4 at /usr/local/lib/node_modules/casperjs, using phantomjs version 2.1.1
Usage: casperjs [options] script.[js|coffee] [script argument [script argument ...]]
       casperjs [options] test [test path [test path ...]]
       casperjs [options] selftest


Options:


--verbose   Prints log messages to the console
--log-level Sets logging level
--help      Prints this help
--version   Prints out CasperJS version
--engine=name Use the given engine. Current supported engine: phantomjs and slimerjs


Read the docs http://docs.casperjs.org/


TypeError: Attempting to change the setter of an unconfigurable property.
TypeError: Attempting to change the setter of an unconfigurable property.

Any idea why?