eclipse won't run minecraft

[DTaylorMedia]

I tried to test my mod, but eclipse gave me an error.

 

Exception in thread "main" java.lang.RuntimeException: java.io.FileNotFoundException: C:\Documents and Settings\user\.gradle\caches\minecraft\assets\indexes\{ASSET_INDEX}.json (The system cannot find the file specified)

at com.google.common.base.Throwables.propagate(Throwables.java:160)

at GradleStart.setupAssets(GradleStart.java:274)

at GradleStart.startClient(GradleStart.java:82)

at GradleStart.main(GradleStart.java:56)

Caused by: java.io.FileNotFoundException: C:\Documents and Settings\user\.gradle\caches\minecraft\assets\indexes\{ASSET_INDEX}.json (The system cannot find the file specified)

at java.io.FileInputStream.open(Native Method)

at java.io.FileInputStream.<init>(Unknown Source)

at java.io.FileReader.<init>(Unknown Source)

at GradleStart.loadAssetsIndex(GradleStart.java:280)

at GradleStart.setupAssets(GradleStart.java:218)

... 2 more

 

Please help. Thanks.

P.S. I have noticed there's 2 ".gradle" folders. one mentioned in the error above & one in the forge folder where my workspace is. Could it be I've setup forge wrong?

[SanAndreaP]

rerun

gradlew setupDecompWorkspace

and your problem will be gone.

[DTaylorMedia]

I rerun gradle setupDecompWorkspace & I got a failure.

 

[color=red]FAILURE: Build failed with an expection.[/color]

* What went wrong:
Execution failed for task ':makeStart'.
> Cannot find System Java Complier. Ensure that you have installed a JDK (not just a JRE) and configured your JAVA_HOME system variable to point to the according directory.

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

[color=red]BUILD FAILED[/color]

 

Not sure what to do.