Build error caused by the package named `interface`

[entrealist]

Faced the problem using the Gappin UI library in a project.

Here is the output:

path/activities/MainActivity.java:72: error: <identifier> expected
public final class MainActivity extends androidx.appcompat.app.AppCompatActivity implements com.gappein.sdk.ui.view.channelview.interface.OnChannelClick {
                                                                                                                                  ^
path/activities/MainActivity.java:72: error: illegal start of type
public final class MainActivity extends androidx.appcompat.app.AppCompatActivity implements com.gappein.sdk.ui.view.channelview.interface.OnChannelClick {
                                                                                                                                           ^
path/activities/MainActivity.java:72: error: ';' expected
public final class MainActivity extends androidx.appcompat.app.AppCompatActivity implements com.gappein.sdk.ui.view.channelview.interface.OnChannelClick {
                                                                                                                                                          ^
path/activities/MainActivity.java:75: error: illegal start of expression
    private android.content.Context mContext;
    ^
path/activities/MainActivity.java:76: error: illegal start of expression
    private androidx.drawerlayout.widget.DrawerLayout drawerLayout;
    ^
path/activities/MainActivity.java:77: error: illegal start of expression
    private android.widget.FrameLayout FlipButtonContainer;
    ^
path/activities/MainActivity.java:78: error: illegal start of expression
    private android.widget.FrameLayout audioButtonContainer;
    ^
path/activities/MainActivity.java:79: error: illegal start of expression
    private android.widget.ImageView FlipButton;
    ^
path/activities/MainActivity.java:80: error: illegal start of expression
    private android.widget.ImageView sendAudioButton;
    ^
path/activities/MainActivity.java:81: error: illegal start of expression
    private android.widget.ImageView moreButton;
    ^
path/activities/MainActivity.java:84: error: illegal start of expression
    private android.animation.AnimatorSet activeAnimetion;
    ^
path/activities/MainActivity.java:85: error: illegal start of expression
    private android.animation.AnimatorSet activeAnimetion2;
    ^
path/activities/MainActivity.java:86: error: illegal start of expression
    private android.animation.AnimatorSet activeAnimetionAudio;
    ^
path/activities/MainActivity.java:87: error: illegal start of expression
    private int activeAnimetionType = 0;
    ^
path/activities/MainActivity.java:88: error: illegal start of expression
    private android.widget.EditText taskEdit;
    ^
path/activities/MainActivity.java:89: error: illegal start of expression
    private boolean isPaused = false;
    ^
path/activities/MainActivity.java:90: error: illegal start of expression
    private final boolean forceShowFlipButton = false;
    ^
    ... 
**e: java.lang.IllegalStateException: failed to analyze: java.lang.IllegalStateException: processingEnv must not be null**
        at org.jetbrains.kotlin.analyzer.AnalysisResult.throwIfError(AnalysisResult.kt:56)
        at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:190)
        at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:164)
        at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:51)
        at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:86)
        at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:44)
        at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:98)
        at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1549)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
        at sun.rmi.transport.Transport$1.run(Transport.java:200)
        at sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
**Caused by: java.lang.IllegalStateException: processingEnv must not be null**
        at androidx.room.RoomProcessor.getSupportedOptions(RoomProcessor.kt:57)
        at org.jetbrains.kotlin.kapt3.base.incremental.IncrementalProcessor.getSupportedOptions(incrementalProcessors.kt)
        at org.jetbrains.kotlin.kapt3.base.incremental.IncrementalProcessor.createDependencyCollector(incrementalProcessors.kt:46)
        at org.jetbrains.kotlin.kapt3.base.incremental.IncrementalProcessor.access$createDependencyCollector(incrementalProcessors.kt:23)
        at org.jetbrains.kotlin.kapt3.base.incremental.IncrementalProcessor$dependencyCollector$1.invoke(incrementalProcessors.kt:26)
        at org.jetbrains.kotlin.kapt3.base.incremental.IncrementalProcessor$dependencyCollector$1.invoke(incrementalProcessors.kt:23)
        at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
        at org.jetbrains.kotlin.kapt3.base.incremental.IncrementalProcessor.getRuntimeType(incrementalProcessors.kt:72)
        at org.jetbrains.kotlin.kapt3.base.incremental.IncrementalAptCache.updateCache(IncrementalAptCache.kt:26)
        at org.jetbrains.kotlin.kapt3.base.incremental.JavaClassCacheManager.updateCache(cache.kt:22)
        at org.jetbrains.kotlin.kapt3.base.AnnotationProcessingKt.doAnnotationProcessing(annotationProcessing.kt:86)
        at org.jetbrains.kotlin.kapt3.base.AnnotationProcessingKt.doAnnotationProcessing$default(annotationProcessing.kt:34)
        at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.runAnnotationProcessing(Kapt3Extension.kt:229)
        at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.analysisCompleted(Kapt3Extension.kt:192)
        at org.jetbrains.kotlin.kapt3.ClasspathBasedKapt3Extension.analysisCompleted(Kapt3Extension.kt:100)
        at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM$analyzeFilesWithJavaIntegration$2.invoke(TopDownAnalyzerFacadeForJVM.kt:108)
        at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:118)
        at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:93)
        at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:526)
        at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:90)
        at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.kt:115)
        at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.kt:517)
        at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:185)
        ... 23 more```