Build exception

command

PS D:\Development\Minecraft\SmithsCore> ./gradlew build
#################################################
         ForgeGradle 2.1-SNAPSHOT-12e92a7
  https://github.com/MinecraftForge/ForgeGradle
#################################################
               Powered by MCP unknown
             http://modcoderpack.com
         by: Searge, ProfMobius, Fesh0r,
         R4wk, ZeuX, IngisKahn, bspkrs
#################################################
Found AccessTransformer: SmithsCore_at.cfg
:deobfCompileDummyTask
:deobfProvidedDummyTask
:compileApiJava UP-TO-DATE
:processApiResources UP-TO-DATE
:apiClasses UP-TO-DATE
:sourceMainJava
:compileJava
warning: [options] bootstrap class path not set in conjunction with -source 1.6
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 warning
:processResources UP-TO-DATE
:classes
:jar
:javadoc
:javadocJar
:compileTestJava UP-TO-DATE
:processTestResources UP-TO-DATE
:testClasses UP-TO-DATE
:test UP-TO-DATE
:extractMcpData SKIPPED
:extractMcpMappings SKIPPED
:getVersionJson
:extractUserdev UP-TO-DATE
:genSrgs SKIPPED
:reobfJar
:extractRangemapSrc
:retromapSources
remapping source...
:sourceJar

FAILURE: Build failed with an exception.

* What went wrong:
Failed to capture snapshot of input files for task 'sourceJar' during up-to-date check.  See stacktrace for details.
> java.io.FileNotFoundException: com\SmithsModding\SmithsCore\Client\GUI\Components\IGUIComponent.java (The system cannot find the path specified)

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

BUILD FAILED