Big notification in ionic 3 using FCM

I want to send big notification using firebase. I add this code to MyFirebaseMessagingService.java page of FCM plugin

 .setStyle(new NotificationCompat.BigPictureStyle()
                                .bigPicture(myBitmap)
                                .bigLargeIcon(null))
                        .build();

but it shows error:


* What went wrong:
Execution failed for task ':compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
(node:5376) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: cmd: Command failed with exit code 1 Error output:
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
C:\Users\faizy\Desktop\styleplus\platforms\android\src\com\gae\scaffolder\plugin\MyFirebaseMessagingService.java:80: error: cannot find symbol
                                .bigPicture(myBitmap)
                                            ^
  symbol:   variable myBitmap
  location: class MyFirebaseMessagingService
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

how can I do this?