Getting error in Plugin, studio doesn't recognize arb file.

Hi to all,
I 'm getting following error when my android studio is started, And studio doesn't recognize arb file.

java.lang.ClassCastException: com.intellij.psi.impl.file.PsiBinaryFileImpl cannot be cast to com.intellij.json.psi.JsonFile
at eu.long1.flutter.i18n.workers.I18nFileGenerator.generate(I18nFileGenerator.kt:34)
at eu.long1.flutter.i18n.workers.Initializer$runActivity$$inlined$scheduleAtFixedRate$1$lambda$1.compute(actions.kt:64)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:945)
at eu.long1.flutter.i18n.workers.Initializer$runActivity$$inlined$scheduleAtFixedRate$1.run(Timer.kt:150)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)

Flutter Doctor

• [✓] Flutter (Channel stable, v1.0.0, on Mac OS X 10.13.6 17G65, locale - zh-Hans-CN)
• [✓] Android toolchain - develop for Android devices (Android SDK 28.0.3)
• [✓] iOS toolchain - develop for iOS devices (Xcode 10.1)
• [✓] Android Studio (version 3.3)
• [✓] VS Code (version 1.31.1)
• [✓] Connected device (2 available)

• No issues found!