Can't setup MCreator

I'm getting the same thing, and i allowed java through the firewall too and ran as admin? i apologise if this is the excact same error log i thought i'd include it just in case... love the mod creator, have used the 1.10, the 1.8 and the 1.7.5 and loved them all!

Executing gradle command: cleanCache clean setupDecompWorkspace --refresh-dependencies
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
C:\Pylo\MCreator176>cd forge
C:\Pylo\MCreator176\forge>SET "JAVA_HOME=C:\Pylo\MCreator176\jdk32\"
C:\Pylo\MCreator176\forge>SET JAVA_EXE=%JAVA_HOME%\bin\java.exe
C:\Pylo\MCreator176\forge>SET PATH=%JAVA_HOME%\bin\;%PATH%
C:\Pylo\MCreator176\forge>gradlew -Dorg.gradle.jvmargs="-Xms512m -Xmx1024m" cleanCache clean setupDecompWorkspace --refresh-dependencies
This mapping 'snapshot_20170624' was designed for MC 1.12! Use at your own peril.
#################################################
         ForgeGradle 2.3-SNAPSHOT-583d1ba       
  https://github.com/MinecraftForge/ForgeGradle 
#################################################
               Powered by MCP unknown              
             http://modcoderpack.com            
         by: Searge, ProfMobius, Fesh0r,        
         R4wk, ZeuX, IngisKahn, bspkrs          
#################################################
:cleanCache
:clean UP-TO-DATE
:deobfCompileDummyTask
:deobfProvidedDummyTask
:getVersionJson
:extractUserdev
:extractDependencyATs SKIPPED
:extractMcpData
:extractMcpMappings
:genSrgs
:downloadClient
:downloadServer
:splitServerJar
:mergeJars
:deobfMcSRG
Applying SpecialSource...
Applying Exceptor...
:decompileMc
Error occurred during initialization of VM
Could not reserve enough space for 3145728KB object heap
:decompileMc FAILED
FAILURE: Build failed with an exception.
BUILD FAILED
* What went wrong:
Execution failed for task ':decompileMc'.
Total time: 2 mins 28.972 secs
> Process 'command 'C:\Pylo\MCreator176\jdk32\bin\java.exe'' finished with non-zero exit value 1
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
C:\Pylo\MCreator176\forge>
Task completed with return code 0 in 149333 milliseconds

"Could not reserve enough space for 3145728KB object heap"

Is there enough disk space where you're trying to install it? 3145728KB is 3 GB.

Please search forums before posting new topics:

https://mcreator.net/node/39866

   
Executing gradle command: cleanCache clean setupDecompWorkspace --refresh-dependencies
Microsoft Windows [Version 6.3.9600]
(c) 2013 Microsoft Corporation. All rights reserved.
D:\mcreator>cd forge
D:\mcreator\forge>SET "JAVA_HOME=D:\mcreator\jdk32\"
D:\mcreator\forge>SET JAVA_EXE=%JAVA_HOME%\bin\java.exe
D:\mcreator\forge>SET PATH=%JAVA_HOME%\bin\;%PATH%
D:\mcreator\forge>gradlew -Dorg.gradle.jvmargs="-Xms512m -Xmx1024m" cleanCache clean setupDecompWorkspace --refresh-dependencies 
This mapping 'snapshot_20170624' was designed for MC 1.12! Use at your own peril.
#################################################
         ForgeGradle 2.3-SNAPSHOT-583d1ba        
  https://github.com/MinecraftForge/ForgeGradle  
#################################################
               Powered by MCP unknown               
             http://modcoderpack.com             
         by: Searge, ProfMobius, Fesh0r,         
         R4wk, ZeuX, IngisKahn, bspkrs           
#################################################
:cleanCache
:clean UP-TO-DATE
:deobfCompileDummyTask
:deobfProvidedDummyTask
:getVersionJson
:extractUserdev
:extractDependencyATs SKIPPED
:extractMcpData
:extractMcpMappings
:genSrgs
:downloadClient
:downloadServer
:splitServerJar
:mergeJars
:deobfMcSRG
Applying SpecialSource...
Applying Exceptor...
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
   at java.util.Arrays.copyOfRange(Arrays.java:3664)
   at java.lang.String.(String.java:207)
   at java.io.DataInputStream.readUTF(DataInputStream.java:661)
   at java.io.DataInputStream.readUTF(DataInputStream.java:564)
   at org.jetbrains.java.decompiler.struct.consts.ConstantPool.(ConstantPool.java:55)
   at org.jetbrains.java.decompiler.struct.StructClass.(StructClass.java:84)
   at org.jetbrains.java.decompiler.struct.StructClass.(StructClass.java:72)
   at org.jetbrains.java.decompiler.struct.StructContext.addArchive(StructContext.java:162)
   at org.jetbrains.java.decompiler.struct.StructContext.addSpace(StructContext.java:101)
   at org.jetbrains.java.decompiler.struct.StructContext.addSpace(StructContext.java:79)
   at org.jetbrains.java.decompiler.main.decompiler.BaseDecompiler.addSpace(BaseDecompiler.java:36)
   at net.minecraftforge.gradle.tasks.fernflower.FernFlowerInvoker.runFernFlower(FernFlowerInvoker.java:68)
   at net.minecraftforge.gradle.tasks.fernflower.FernFlowerInvoker.main(FernFlowerInvoker.java:41)
Picked up _JAVA_OPTIONS: -Xmx900m
:decompileMc FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':decompileMc'.
> Process 'command 'D:\mcreator\jdk32\bin\java.exe'' finished with non-zero exit value 1
* 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: 7 mins 12.666 secs
Picked up _JAVA_OPTIONS: -Xmx900m
D:\mcreator\forge>
Task completed with return code 0 in 446141 milliseconds

this is it

the adding of 'xms=512 xmx=2048'  to the pref file helped for me, and sorry about posting it here originaly althoug i did think this was the only post :s thanks for the fix though

if you've read the report Matej has provided i think you'll see that in my case atleast i think you were right :)

Try to use 32 bit version if possible.