How to fix below issue?

I am using Gatling V2.2.4 on Windows 7 and facing below problem.
My java version is 1.8

GATLING_HOME is set to "D:\Gatling\gatling-charts-highcharts-bundle-2.2.4-bundle**\gatling-charts-highcharts-bundle-2.2.4"**
JAVA = "java"
The input line is too long.

In your answer, If anybody suggest to set path in environment variable then please let me know the exact steps with the url which I need to set.
and also let me know whether it resolve my problem?

Please reply ASAP.
Thank You.