conference-app-2020: Failed to build iOS App

Hello, I would like you to tell me why I failed to build iOS App. The details are as follows. I know that you are busy, so I am sorry for your inconvenience.

Overview (Required)

• Failed to build iOS App like the issue (#514)

Steps To Reproduce

1. Clone this repository
2. Move to the directory named ios-base and run the command make init && open DroidKaigi\ 2020.xcworkspace
3. Build the project
4. See error

Showing All Messages
FAILURE: Build failed with an exception.



* What went wrong:

A problem occurred configuring project ':android-base'.

> kotlin.KotlinNullPointerException (no error message)



* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.



* Get more help at https://help.gradle.org



Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.

Use '--warning-mode all' to show the individual deprecation warnings.

See https://docs.gradle.org/6.1/userguide/command_line_interface.html#sec:command_line_warnings



BUILD FAILED in 755ms

mkdir: /Users/k_muta/Documents/conference-app-2020/ios-base/build: File exists

cp: /Users/k_muta/Documents/conference-app-2020/ios-base/../ios-combined/build/bin/iosX64/debugFramework/ios_combined.framework: No such file or directory

Env:

• OS: Mac OS Mojave
• Tool: Xcode 11.3