Overload resolution ambiguity: File.kt vs FileKt.class

My exact error is:

Overload resolution ambiguity. All these functions match.
public fun isEven(permutation: List<Int>): Boolean defined in games.gameOfFifteen in file GameOfFifteenHelperKt.class
public fun isEven(permutation: List<Int>): Boolean defined in games.gameOfFifteen in file GameOfFifteenHelper.kt

I'm getting a similar error for the GameOfFifteen file:
Conflicting overloads: public fun newGameOfFifteen(initializer: GameOfFifteenInitializer = ...): Game defined in games.gameOfFifteen in file GameOfFifteen.kt, public fun newGameOfFifteen(initializer: GameOfFifteenInitializer): Game defined in games.gameOfFifteen in file GameOfFifteenKt.class

This started recently and I'm not sure why.  I couldn't find any help for file.kt ... fileKt.class on line.

I'm stuck.  Any help would be appreciated.

Steve S.

IDE info:
IntelliJ IDEA 2019.2.3 (Community Edition)
Build #IC-192.6817.14, built on September 23, 2019
Runtime version: 11.0.4+10-b304.69 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 4.15.0-64-generic
GC: ParNew, ConcurrentMarkSweep
Memory: 939M
Cores: 6
Registry:
Non-Bundled Plugins: org.jetbrains.kotlin, com.jetbrains.edu

Build.log:
2019-10-01 11:33:22,225 [ 469243] INFO - .incremental.IncProjectBuilder - Building project; isRebuild:false; isMake:false parallel compilation:false
2019-10-01 11:33:22,226 [ 469244] INFO - kotlin.jps.build.KotlinBuilder - is Kotlin incremental compilation enabled for JVM: true
2019-10-01 11:33:22,226 [ 469244] INFO - kotlin.jps.build.KotlinBuilder - is Kotlin incremental compilation enabled for JS: true
2019-10-01 11:33:22,228 [ 469246] INFO - kotlin.jps.build.KotlinBuilder - is Kotlin compiler daemon enabled: true
2019-10-01 11:33:22,228 [ 469246] INFO - kotlin.jps.build.KotlinBuilder - Label in local history: build started 37d32b5c
2019-10-01 11:33:22,260 [ 469278] INFO - .incremental.IncProjectBuilder - Cleaned output directories in 2 ms
2019-10-01 11:33:22,671 [ 469689] INFO - kotlin.jps.build.KotlinBuilder - KotlinTargetsIndex created in 367 ms
2019-10-01 11:33:22,681 [ 469699] INFO - kotlin.jps.build.KotlinBuilder - Total Kotlin global compile context initialization time: 378 ms
2019-10-01 11:33:23,156 [ 470174] INFO - kotlin.jps.build.KotlinBuilder - Compiled successfully
2019-10-01 11:33:23,268 [ 470286] INFO - brains.jps.incremental.Builder - Dependency analysis found 1 affected files
2019-10-01 11:33:23,542 [ 470560] INFO - kotlin.jps.build.KotlinBuilder - Compiled successfully
2019-10-01 11:33:23,562 [ 470580] INFO - brains.jps.incremental.Builder - Dependency analysis found 1 affected files
2019-10-01 11:33:23,570 [ 470588] INFO - rains.jps.cmdline.BuildSession - Build duration: Builder 'Kotlin Builder' took 688 ms; 2 sources processed (344 ms per file)
2019-10-01 11:33:23,570 [ 470588] INFO - rains.jps.cmdline.BuildSession - Build duration: Builder 'Resource Compiler' took 2 ms; 1 sources processed (2 ms per file)
2019-10-01 11:33:24,164 [ 0] INFO - etbrains.jps.cmdline.BuildMain - ==================================================
2019-10-01 11:33:24,164 [ 0] INFO - etbrains.jps.cmdline.BuildMain - Build process started. Classpath: /home/sjs/idea-IC-191.7479.19/plugins/java/lib/jps-launcher.jar:/usr/lib/jvm/java-1.11.0-openjdk-amd64/lib/classes.zip
2019-10-01 11:33:24,330 [ 166] INFO - etbrains.jps.cmdline.BuildMain - Connection to IDE established in 146 ms
2019-10-01 11:33:24,387 [ 223] INFO - #com.intellij.jna.JnaLoader - JNA library (64-bit) loaded in 55 ms
2019-10-01 11:33:24,440 [ 276] INFO - jps.cmdline.JpsModelLoaderImpl - Loading model: project path = /home/sjs/dev/coursera/GameBoard, global options path = /home/sjs/.IdeaIC2019.2/config/options
2019-10-01 11:33:24,782 [ 618] INFO - jps.cmdline.JpsModelLoaderImpl - Model loaded in 342 ms
2019-10-01 11:33:24,782 [ 618] INFO - jps.cmdline.JpsModelLoaderImpl - Project has 1 modules, 1 libraries
2019-10-01 11:33:24,875 [ 711] INFO - ellij.util.io.PagedFileStorage - lower=100; upper=500; buffer=10; max=680
2019-10-01 11:33:24,934 [ 770] INFO - etbrains.jps.cmdline.BuildMain - Pre-loaded process ready in 770 ms