Getting Java heap space error in SoapUI NG pro

I have set vmoptions file as below and now not able to launch a tool.

-set JAVA_OPTS=%JAVA_OPTS%
-Xms128m
-Xmx4000m
-Dsoapui.properties=soapui.properties
-Dsoapui.home=C:\Program Files (x86)\SmartBear\ReadyAPI-1.3.0-m-SNAPSHOT/bin
-Dsoapui.ext.libraries=C:\Program Files (x86)\SmartBear\ReadyAPI-1.3.0-m-SNAPSHOT/bin/ext
-Dsoapui.ext.listeners=C:\Program Files (x86)\SmartBear\ReadyAPI-1.3.0-m-SNAPSHOT/bin/listeners
-Dsoapui.ext.actions=C:\Program Files (x86)\SmartBear\ReadyAPI-1.3.0-m-SNAPSHOT/bin/actions
-Dwsi.dir=C:\Program Files (x86)\SmartBear\ReadyAPI-1.3.0-m-SNAPSHOT/wsi-test-tools
-Djava.library.path=C:\Program Files (x86)\SmartBear\ReadyAPI-1.3.0-m-SNAPSHOT/bin
-Djava.util.Arrays.useLegacyMergeSort=true
-XX:MaxPermSize=256m