I rebuilt the project on the new Corona SDK build. Now, with fetchData, it produces an error:
Build 2018.3335
stack traceback: [C]: in function 'fetchData ERROR: Runtime error java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/common/api/Api$zzf; Java Stack Trace: com.google.android.gms.internal.zzbee.\<clinit\>(Unknown Source) com.google.android.gms.internal.zzbev.\<init\>(Unknown Source) com.google.firebase.remoteconfig.FirebaseRemoteConfig.fetch(Unknown Source) com.google.firebase.remoteconfig.FirebaseRemoteConfig.fetch(Unknown Source) plugin.firebaseConfig.LuaLoader$fetchData.invoke(LuaLoader.java:262) com.ansca.corona.JavaToNativeShim.nativeRender(Native Method) com.ansca.corona.JavaToNativeShim.render(JavaToNativeShim.java:195) com.ansca.corona.Controller.updateRuntimeState(Controller.java:347) com.ansca.corona.graphics.opengl.CoronaGLSurfaceView$CoronaRenderer.onDrawFrame(CoronaGLSurfaceView.java:425) com.ansca.corona.graphics.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1623) com.ansca.corona.graphics.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1378) stack traceback: [C]: ? [C]: in function 'fetchData' ?: in function 'init' ?: in function \<?:21\> ?: in function 'init' ?: in function 'method' /Users/jenkins/slaveroot/workspace/Templates/label/android/platform/resources/init.lua:221: in function 'dispatchEvent' /Users/jenkins/slaveroot/workspace/Templates/label/android/subrepos/composer/composer.lua:1118: in function \</Users/jenkins/slaveroot/workspace/Templates/label/android/subrepos/composer/composer.lua:1056\> (tail call): ? ?: in function 'listener' /Users/jenkins/slaveroot/workspace/Templates/label/android/subrepos/timer/timer.lua:212: in function 'method' /Users/jenkins/slaveroot/workspace/Templates/label/android/platform/resources/init.lua:221: in function \</Users/jenkins/slaveroot/workspace/Templates/label/android/platform/resources/init.lua:190\>