compileSdkVersion is not specified

[jyk2joe]

I encountered the following error when compiling

• What went wrong:
  A problem occurred configuring project ':reactive_ble_mobile'.

Failed to notify project evaluation listener.
Cannot invoke method substring() on null object
compileSdkVersion is not specified. Please add it to build.gradle

[vbuberen]

You could at least look at the source code to see that compileSDK is specified in that package https://github.com/PhilipsHue/flutter_reactive_ble/blob/master/packages/reactive_ble_mobile/android/build.gradle#L41

So it is something on your side.

[Taym95]

As @vbuberen said: compileSdkVersion 33 already specified