I keep getting this error message when doing

gradlew setupDecompWorkspace eclipse

 

E:\Mod>gradlew setupDecompWorkspace eclipse
This set of MCP mappings was designed for MC 1.8.8. Use at your own peril.
#################################################
         ForgeGradle 2.1-SNAPSHOT-75bb646
  https://github.com/MinecraftForge/ForgeGradle
#################################################
               Powered by MCP unknown
             http://modcoderpack.com
         by: Searge, ProfMobius, Fesh0r,
         R4wk, ZeuX, IngisKahn, bspkrs
#################################################
:deobfCompileDummyTask
:deobfProvidedDummyTask
:getVersionJson
:extractUserdev
:extractDependencyATs SKIPPED
:extractMcpData SKIPPED
:extractMcpMappings
:genSrgs SKIPPED
:downloadClient SKIPPED
:downloadServer SKIPPED
:splitServerJar SKIPPED
:mergeJars SKIPPED
:deobfMcSRG SKIPPED
:decompileMc FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':decompileMc'.
> Java heap space

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 45.11 secs

I can't find anything that really says how to allocate more RAM to it. Do you happen to know how?

Now I'm getting this:

 

E:\Mod>gradlew setupDecompWorkspace eclipse
Error occurred during initialization of VM
Could not reserve enough space for 2048000KB object heap