[1.7.10/stable forge version] Forge crashs while debugging :(

Hey Guys, please help me. My forge crashs while debugging and I don't know why.

~Santa

CRASH REPORT

#[18:56:51] [main/INFO] [GradleStart]: No arguments specified, assuming client.

[18:56:51] [main/INFO] [GradleStart]: Extra: []

Exception in thread "main" java.lang.RuntimeException: java.io.FileNotFoundException: C:\Users\Lorenz\.gradle\caches\minecraft\assets\indexes\{ASSET_INDEX}.json (Das System kann die angegebene Datei nicht finden)

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

at GradleStart.setupAssets(GradleStart.java:260)

at GradleStart.startClient(GradleStart.java:82)

at GradleStart.main(GradleStart.java:56)

Caused by: java.io.FileNotFoundException: C:\Users\Lorenz\.gradle\caches\minecraft\assets\indexes\{ASSET_INDEX}.json (Das System kann die angegebene Datei nicht finden)

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:266)

at GradleStart.setupAssets(GradleStart.java:204)

... 2 more

Java HotSpot 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release