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Fixed in Beta 7.
Thanks

#2 Thanks for your verification!
#3 Could you please elaborate what doesn't work for you?

what i can do with demodep.zip ?

This issue is still present on the official release of Android Studio 3.0:

Android Studio 3.0
Build #AI-171.4408382, built on October 20, 2017
JRE: 1.8.0_152-release-915-b08 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Mac OS X 10.13.1

This happens sometimes after I do a Gradle sync with my android project that support kotlin, and I haven't found a way to reproduce it every time. I usually solved it by doing a Gradle sync again.
When I go to any of my kotlin source code when this issue arises, I get a yellow warning like bar at the top of the code editor saying "Kotlin not configured" though it is actually configured and I can write and build kotlin successfully before. When this happens, I also get errors in the source code because the editor might think I'm writing Java code.

#6 What version of Android Gradle Plugin do you use in your project?

3.0.0
I found this line
classpath 'com.android.tools.build:gradle:3.0.0'
in my dependencies

Re #8, it is likely that kotlin is not configured properly with some modules in your project.
Please make sure that every module that contains kotlin source code - (not just app module) has applied kotlin plugin in Gradle build file, and also has dependencies on kotlin library.
i.e. "apply plugin: 'kotlin-android'"
and in dependencies block, there is something like "implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"".

If you have already done this, please share more details about your project setup so I can try to reproduce the issue. Thanks!

The Module App is my only module. I found "implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"" and "apply plugin: 'kotlin-android'" in my build.gradle for Module App.

This issue DOES NOT affect me permanently but randomly every time I did a gradle sync. The last time it happens is when I changed my buildToolsVersion from "27.0.0" to "27.0.1" then AS informed me to do a gradle sync for it to take effect and I did. After a gradle sync the issue appeared but it disappeared immediately after I did a gradle sync again. I've encountered this issue multiple times. EVERY TIME it's associated with gradle sync

I haven't checked if I can build the project successfully when this issue arises but indeed I saw lots of errors from the lint check for my kotlin source code files so I basically can't work on this project until I did a gradle sync again to fix this issue

In my build.gradle file for my app module:
compileSdkVersion 27
buildToolsVersion "27.0.1"
minSdkVersion 15
targetSdkVersion 27

build.gradle file for my whole project:
ext.kotlin_version = '1.1.51'

That's all the information that I think is useful for you in my build script. I used all default settings except that I added Kotlin support when I set up the project

Re #10, thank you for your information.
This is a different issue than the one in this post, the original problem was between inter-module dependencies.
I filed a new issue based on your feedback, issuetracker.google.com/issues/69165920.
Any update will be posted there and please add any additional information there as well.
Thanks!