NullPointerException in idea plugin

Whenever I try to synchronize my project to XCode, I get a NullPointerException
Here is the stack trace:

Unable to generate binding
java.lang.NullPointerException
	at org.moe.generator.project.XcodeTarget.getSupportingFilesGroup(XcodeTarget.java:270)
	at org.moe.idea.binding.MOEBindingGeneratorByJava.generate(MOEBindingGeneratorByJava.java:135)
	at org.moe.idea.actions.SynchronizeToXcodeAction$1$1.run(SynchronizeToXcodeAction.java:157)
	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:950)
	at org.moe.idea.actions.SynchronizeToXcodeAction$1.run(SynchronizeToXcodeAction.java:138)
	at com.intellij.openapi.progress.impl.CoreProgressManager$5.run(CoreProgressManager.java:227)
	at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:563)
	at com.intellij.openapi.progress.impl.CoreProgressManager$8.run(CoreProgressManager.java:357)
	at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:142)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:446)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:392)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:127)
	at com.intellij.openapi.application.impl.ApplicationImpl$13$1.run(ApplicationImpl.java:633)
	at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:369)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	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)

To reproduce this, do all the steps required here: https://doc.multi-os-engine.org/multi-os-engine/4_create_ui/2_with_storyboard/with_storyboard.html
After that right click to the moe project -> Multi-OS Engine Actions -> Synchronize to Xcode
This gives a plugin error.

Dear Balázs Bencze,

we were able to reproduce the issue and are working on a fix for it.

Dear Balázs Bencze,

we have released Multi-OS Engine Android Studio plugin 1.2.1. It should fix your issue.