Error: unable to open display Scilab version "5.5.2.1427793548" scilab-5.5.2

Error: unable to open display Usage: scilab <arguments> scilab-cli <arguments> scilab-adv-cli <arguments> Possible arguments are: -display Display: for use under Xwindow systems to set a specific X server display. -d Display : equivalent to -display Display. -e Instruction : execute the scilab instruction given in Instruction argument. -e and -f arguments are mutually exclusive. -f File : execute the scilab script given in File argument. -e and -f arguments are mutually exclusive. -l Lang : set the current language. Lang can be equal to fr or en. -mem N : set the initial stacksize, for use with -ns argument. -nb : do not display Scilab loading on start. -ns : do not execute scilab.start startup file. This argument will disable many features in Scilab (Only use if you know what you are doing). -nouserstartup : do not execute the user startup files SCIHOME/.scilab or SCIHOME/scilab.ini. -noatomsautoload: do not load ATOMS installed module. -nw : start Scilab without dedicated Scilab Window. -nwni : start Scilab without the GUI, graphic and help features (batch mode). This argument disables the need of Java. -nogui : See -nwni -nocolor : Remove the color in the cli and adv-cli modes -args : accept all extra arguments and make them available through sciargs -version : print product version and exit. -h/--help : display help about this command. --texmacs : reserved for TeXMacs. Developer arguments: -debug : Start Scilab under gdb (Unix/linux only). define the variable SCILAB_GDB_OPT to add custom arguments to gdb. -debug-kdbg : Start Scilab under kdbg (Unix/linux only). -profiling : Start Scilab under valgrind (Unix/linux only). define the variable SCILAB_VALGRIND_OPT to add custom arguments to valgrind (and override the existing valgrind arguments). -profiling-visu : Start Scilab under callgrind (Unix/linux only). define the variable SCILAB_VALGRIND_OPT to add custom arguments to callgrind (and override the existing callgrind arguments). -disable-exception-catching : Disable Scilab exception catching system. All these arguments can be retrieved by the Scilab function sciargs. Several environment variables can be declared: SCIVERBOSE Provides debugging information of the startup JAVA_HOME Declares which Java Virtual Machine to use SCI_DISABLE_TK Disable Tk (but not Tcl) features SCI_JAVA_ENABLE_HEADLESS Enable Java Headless VM (ie without GUI features) SCI_DISABLE_EXCEPTION_CATCHING Disable the catch by Scilab of exception (segfault, ...)