Can't run Gatling 2.2.3

[Remco W]

I'm using gatling 2.2.3 and I'm following the Quickstart guide. I've got it all working up until the point where I can run the scenario.

Instead of allowing me to select the simulation I want to run I'm getting this output:

U:\>%GATLING_HOME%\bin\gatling.bat

GATLING_HOME is set to "C:\Users\name\Downloads\gatling-charts-highcharts-bundle-2.2.3\"

JAVA = "java"

Usage: java [-options] class [args...]

           (to execute a class)

   or  java [-options] -jar jarfile [args...]

           (to execute a jar file)

where options include:

    -d32          use a 32-bit data model if available

    -d64          use a 64-bit data model if available

    -server       to select the "server" VM

                  The default VM is server.

    -cp <class search path of directories and zip/jar files>

    -classpath <class search path of directories and zip/jar files>

                  A ; separated list of directories, JAR archives,

                  and ZIP archives to search for class files.

    -D<name>=<value>

                  set a system property

    -verbose:[class|gc|jni]

                  enable verbose output

    -version      print product version and exit

    -version:<value>

                  Warning: this feature is deprecated and will be removed

                  in a future release.

                  require the specified version to run

    -showversion  print product version and continue

    -jre-restrict-search | -no-jre-restrict-search

                  Warning: this feature is deprecated and will be removed

                  in a future release.

                  include/exclude user private JREs in the version search

    -? -help      print this help message

    -X            print help on non-standard options

    -ea[:<packagename>...|:<classname>]

    -enableassertions[:<packagename>...|:<classname>]

                  enable assertions with specified granularity

    -da[:<packagename>...|:<classname>]

    -disableassertions[:<packagename>...|:<classname>]

                  disable assertions with specified granularity

    -esa | -enablesystemassertions

                  enable system assertions

    -dsa | -disablesystemassertions

                  disable system assertions

    -agentlib:<libname>[=<options>]

                  load native agent library <libname>, e.g. -agentlib:hprof

                  see also, -agentlib:jdwp=help and -agentlib:hprof=help

    -agentpath:<pathname>[=<options>]

                  load native agent library by full pathname

    -javaagent:<jarpath>[=<options>]

                  load Java programming language agent, see java.lang.instrument

    -splash:<imagepath>

                  show splash screen with specified image

See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.

It seems like it's trying to execute some Java command which isn't done properly. Does anyone know how I can fix this?