Can't run Gatling 2.2.3

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=
set a system property
-verbose:[class|gc|jni]
enable verbose output
-version print product version and exit
-version:
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[:…|:]
-enableassertions[:…|:]
enable assertions with specified granularity
-da[:…|:]
-disableassertions[:…|:]
disable assertions with specified granularity
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:[=]
load native agent library , e.g. -agentlib:hprof
see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:[=]
load native agent library by full pathname
-javaagent:[=]
load Java programming language agent, see java.lang.instrument
-splash:
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?