Build error from building CompactWindmills

build_log.txt

Creating properties on demand (a.k.a. dynamic properties) has been deprecated and is scheduled to be removed in Gradle 2.0. Please read http://gradle.org/docs/current/dsl/org.gradle.api.plugins.ExtraPropertiesExtension.html for information on the replacement for dynamic properties.
Deprecated dynamic property: "ENV" on "root project 'CompactWindmills'", value: "{USERPROFILE=C:\Users\...".
The assetDir is deprecated!  Use runDir instead! runDir set to eclipse/assets/..
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:downloadClient SKIPPED
:downloadServer SKIPPED
:extractUserDev UP-TO-DATE
:mergeJars SKIPPED
:applyBinPatches SKIPPED
:downloadMcpTools UP-TO-DATE
:genSrgs SKIPPED
:deobfBinJar SKIPPED
:compileApiJava UP-TO-DATE
:processApiResources UP-TO-DATE
:apiClasses UP-TO-DATE
:sourceMainJava UP-TO-DATE
:compileJavawarning: [options] bootstrap class path not set in conjunction with -source 1.6
C:\Users\Kevin\Documents\GitHub\CompactWindmills\build\sources\java\aroma1997\compactwindmills\TileEntityWindmill.java:46: error: TileEntityWindmill is not abstract and does not override abstract method func_70302_i_() in ISpecialInventory
public class TileEntityWindmill extends TileEntity implements IEnergySource, IWrenchable, ISpecialInventory, IAromaWrenchable {
       ^
1 error
1 warning
 FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.

* 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: 9.664 secs