Struggling to put MainActivity into a new ui package without it causing errors.

I created a new sub package called ui, then as instructed I tried to drag and drop the classes MainActivity and AlertDialogFragment into it as instructed, it then asked do i wish to refactor so I clicked yes and then it came up with the following;

problems detected: Field MainActivity.mTemperatureLabel will be inaccessible from constructor MainActivity_ViewBinding.MainActivity_ViewBinding(T, View) Field MainActivity.mTemperatureLabel will be inaccessible from method MainActivity_ViewBinding.unbind() Field MainActivity.mTimeLabel will be inaccessible from constructor MainActivity_ViewBinding.MainActivity_ViewBinding(T, View) Field MainActivity.mTimeLabel will be inaccessible from method MainActivity_ViewBinding.unbind() Field MainActivity.mIconImageView will be inaccessible from constructor MainActivity_ViewBinding.MainActivity_ViewBinding(T, View) Field MainActivity.mIconImageView will be inaccessible from method MainActivity_ViewBinding.unbind() Field MainActivity.mHumidityValue will be inaccessible from constructor MainActivity_ViewBinding.MainActivity_ViewBinding(T, View) Field MainActivity.mHumidityValue will be inaccessible from method MainActivity_ViewBinding.unbind() Field MainActivity.mSummaryLabel will be inaccessible from constructor MainActivity_ViewBinding.MainActivity_ViewBinding(T, View) Field MainActivity.mSummaryLabel will be inaccessible from method MainActivity_ViewBinding.unbind() Field MainActivity.mPrecipValue will be inaccessible from constructor MainActivity_ViewBinding.MainActivity_ViewBinding(T, View) Field MainActivity.mPrecipValue will be inaccessible from method MainActivity_ViewBinding.unbind()

I then changed the package address in each class by adding .ui which allowed me to refactor the classes without the problems dialog appearing, however errors became highlighted in the code and on trying to run the app the following error messages appeared:

Information:Gradle tasks [:app:clean, :app:generateDebugSources, :app:generateDebugAndroidTestSources, :app:mockableAndroidJar, :app:prepareDebugUnitTestDependencies, :app:assembleDebug] /Users/GroupPay/AndroidStudioProjects/Stormy/app/src/main/java/grouppay/com/stormy/ui/MainActivity.java Error:(45, 16) error: package R does not exist Error:(46, 16) error: package R does not exist Error:(47, 16) error: package R does not exist Error:(48, 16) error: package R does not exist Error:(49, 16) error: package R does not exist Error:(50, 16) error: package R does not exist Error:(45, 40) error: Unable to parse @BindView binding.

java.lang.annotation.AnnotationTypeMismatchException: Incorrectly typed data found for annotation element public abstract int butterknife.BindView.value() (Found data of type R.id) at com.sun.tools.javac.model.AnnotationProxyMaker$ValueVisitor$1AnnotationTypeMismatchExceptionProxy.generateException(AnnotationProxyMaker.java:269) at sun.reflect.annotation.AnnotationInvocationHandler.invoke(AnnotationInvocationHandler.java:84) at com.sun.proxy.$Proxy81.value(Unknown Source) at butterknife.compiler.ButterKnifeProcessor.parseBindView(ButterKnifeProcessor.java:402) at butterknife.compiler.ButterKnifeProcessor.findAndParseTargets(ButterKnifeProcessor.java:275) at butterknife.compiler.ButterKnifeProcessor.process(ButterKnifeProcessor.java:157) at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794) at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705) at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91) at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035) at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176) at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170) at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856) at com.sun.tools.javac.main.Main.compile(Main.java:523) at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129) at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138) at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:46) at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:33) at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.delegateAndHandleErrors(NormalizingJavaCompiler.java:104) at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:53) at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:38) at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:35) at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:25) at org.gradle.api.tasks.compile.JavaCompile.performCompilation(JavaCompile.java:163) at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:145) at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:93) at com.android.build.gradle.tasks.factory.AndroidJavaCompile.compile(AndroidJavaCompile.java:49) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at etc...........................................) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Information:BUILD FAILED Information:Total time: 2.669 secs Information:12 errors Information:0 warnings Information:See complete output in console

In the android manifest I noticed the android:name=".MainActivity" was red so copying someone in the forum I changed it to .ui.MainActivity which removed the highlight. Now the only errors i can see highlighted are R. in the butterknife code eg. @BindView(R.id.timeLabel) TextView mTimeLabel; Saying cannot resolve symbol 'R' I have tried cleaning and rebuilding numerous times throughout trying to fix this but it doesn't seem to help. Almost all of my most frustrating time absorbing problems on this track seem to come from using butterknife, is it really worth it!?