[Nexus 6P Android Development] buddwm:
Even if I pull all the libs from CM to get rid of the lib error, I still get a FC and error. Not sure what else can be done. Will post the entire thing:

02-19 22:14:28.237 4997 4997 D AndroidRuntime: Shutting down VM

02-19 22:14:28.239 4997 4997 E AndroidRuntime: FATAL EXCEPTION: main

02-19 22:14:28.239 4997 4997 E AndroidRuntime: Process: com.android.email, PID: 4997

02-19 22:14:28.239 4997 4997 E AndroidRuntime: java.lang.RuntimeException: Unable to instantiate application com.android.email.EmailApplication: java.lang.ClassNotFoundException: Didn't find class "com.android.email.EmailApplication" on path: DexPathList[[zip file "/system/app/Email/Email.apk"],nativeLibraryDirectories=[/system/app/Email/lib/arm64, /vendor/lib64, /system/lib64]]

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.app.LoadedApk.makeApplication(LoadedApk.java:579)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4712)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.app.ActivityThread.-wrap1(ActivityThread.java)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1408)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.os.Handler.dispatchMessage(Handler.java:102)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.os.Looper.loop(Looper.java:148)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.app.ActivityThread.main(ActivityThread.java:5449)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at java.lang.reflect.Method.invoke(Native Method)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

02-19 22:14:28.239 4997 4997 E AndroidRuntime: Caused by: java.lang.ClassNotFoundException: Didn't find class "com.android.email.EmailApplication" on path: DexPathList[[zip file "/system/app/Email/Email.apk"],nativeLibraryDirectories=[/system/app/Email/lib/arm64, /vendor/lib64, /system/lib64]]

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at java.lang.ClassLoader.loadClass(ClassLoader.java:511)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at java.lang.ClassLoader.loadClass(ClassLoader.java:469)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.app.Instrumentation.newApplication(Instrumentation.java:981)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.app.LoadedApk.makeApplication(LoadedApk.java:574)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	... 9 more

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	Suppressed: java.io.IOException: No original dex files found for dex location /system/app/Email/Email.apk

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at dalvik.system.DexFile.openDexFileNative(Native Method)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at dalvik.system.DexFile.openDexFile(DexFile.java:295)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at dalvik.system.DexFile.<init>(DexFile.java:80)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at dalvik.system.DexFile.<init>(DexFile.java:59)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at dalvik.system.DexPathList.loadDexFile(DexPathList.java:279)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at dalvik.system.DexPathList.makePathElements(DexPathList.java:248)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at dalvik.system.DexPathList.<init>(DexPathList.java:120)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:48)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at dalvik.system.PathClassLoader.<init>(PathClassLoader.java:65)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:58)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.app.LoadedApk.getClassLoader(LoadedApk.java:376)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at android.app.LoadedApk.makeApplication(LoadedApk.java:569)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	... 9 more

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	Suppressed: java.lang.ClassNotFoundException: com.android.email.EmailApplication

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at java.lang.Class.classForName(Native Method)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at java.lang.BootClassLoader.findClass(ClassLoader.java:781)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	at java.lang.ClassLoader.loadClass(ClassLoader.java:504)

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	... 12 more

02-19 22:14:28.239 4997 4997 E AndroidRuntime:	Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

02-19 22:14:28.242 941 2964 W ActivityManager: Force finishing activity com.android.email/.activity.Welcome

Looking specifically at this:

02-19 22:14:28.239 4997 4997 E AndroidRuntime: java.lang.RuntimeException: Unable to instantiate application com.android.email.EmailApplication: java.lang.ClassNotFoundException: Didn't find class "com.android.email.EmailApplication" on path: DexPathList[[zip file "/system/app/Email/Email.apk"],nativeLibraryDirectories=[/system/app/Email/lib/arm64, /vendor/lib64, /system/lib64]]

The same goes for the Exchange apk. I tested on PN ROM without even installing any gapps (just so I could focus on this and only this). Initial tests were done on Ubermallow and PN with gapps installed. Anyway, I wouldn't consider myself an Android expert, so not sure what else to do from here. Maybe someone else can chime in...