D:\dev\tools\flutter\.pub-cache\hosted\pub.dartlang.org\device_calendar-0.0.6\android\src\main\kotlin\com\builttoroam\devicecalendar\DeviceCalendarPlugin.kt: (82, 50): Type mismatch: inferred type is String? but String was expected
e: D:\dev\tools\flutter\.pub-cache\hosted\pub.dartlang.org\device_calendar-0.0.6\android\src\main\kotlin\com\builttoroam\devicecalendar\DeviceCalendarPlugin.kt: (92, 35): Type mismatch: inferred type is String? but String was expected
e: D:\dev\tools\flutter\.pub-cache\hosted\pub.dartlang.org\device_calendar-0.0.6\android\src\main\kotlin\com\builttoroam\devicecalendar\DeviceCalendarPlugin.kt: (96, 31): Type mismatch: inferred type is Long? but Long was expected
e: D:\dev\tools\flutter\.pub-cache\hosted\pub.dartlang.org\device_calendar-0.0.6\android\src\main\kotlin\com\builttoroam\devicecalendar\DeviceCalendarPlugin.kt: (97, 29): Type mismatch: inferred type is Long? but Long was expected
e: D:\dev\tools\flutter\.pub-cache\hosted\pub.dartlang.org\device_calendar-0.0.6\android\src\main\kotlin\com\builttoroam\devicecalendar\DeviceCalendarPlugin.kt: (99, 55): Type mismatch: inferred type is String? but String was expected
e: D:\dev\tools\flutter\.pub-cache\hosted\pub.dartlang.org\device_calendar-0.0.6\android\src\main\kotlin\com\builttoroam\devicecalendar\DeviceCalendarPlugin.kt: (105, 47): Type mismatch: inferred type is String? but String was expected
e: D:\dev\tools\flutter\.pub-cache\hosted\pub.dartlang.org\device_calendar-0.0.6\android\src\main\kotlin\com\builttoroam\devicecalendar\DeviceCalendarPlugin.kt: (105, 59): Type mismatch: inferred type is String? but String was expected

> flutter doctor -v
[√] Flutter (Channel beta, v0.10.2, on Microsoft Windows [version 10.0.16299.726], locale fr-FR)
    • Flutter version 0.10.2 at D:\dev\tools\flutter
    • Framework revision d8cbb80206 (12 days ago), 2018-10-26 01:30:21 -0400
    • Engine revision 6c2ade9fa2
    • Dart version 2.1.0-dev.8.0.flutter-bf26f760b1

[√] Android toolchain - develop for Android devices (Android SDK 28.0.2)
    • Android SDK at C:\Users\...\AppData\Local\Android\sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.2
    • Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)
    • All Android licenses accepted.

[√] Android Studio (version 3.1)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 28.0.1
    • Dart plugin version 173.4700
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)

[√] VS Code, 64-bit edition (version 1.28.2)
    • VS Code at C:\Program Files\Microsoft VS Code
    • Flutter extension version 2.20.0

[√] Connected device (1 available)
    • Android SDK built for x86 • emulator-5554 • android-x86 • Android 9 (API 28) (emulator)