Illegal callback invocation from native module

[BenBrostoff]

Hello - thanks for this library. I'm calling RNVideoEditor.merge as recommended in the README and getting the following error:

ReactNative: Exception in native call  java.lang.RuntimeException: Illegal callback invocation from native module. This callback type only permits a single invocation from native code.
at com.facebook.react.bridge.CallbackImpl.invoke(CallbackImpl.java:28)
at com.reactlibrary.RNVideoEditorModule.merge(RNVideoEditorModule.java:47)
at java.lang.reflect.Method.invoke(Native Method)
at com.facebook.react.bridge.JavaMethodWrapper.invoke(JavaMethodWrapper.java:372)
at com.facebook.react.bridge.JavaModuleWrapper.invoke(JavaModuleWrapper.java:160)
at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:29)
at android.os.Looper.loop(Looper.java:164)
at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:192)
 at java.lang.Thread.run(Thread.java:764)

I'm on React Native 0.55 - any help here would be much appreciated. Thanks again!