[Galaxy S 4 Themes and Apps] yhrn:
I hadn't noticed because I don't use the app but I get FC when opening stock email as well (WanamLite/Domination Dark, JKay). Seems like nobody has posted a logcat so far so I grabbed one. I think this section is the relevant one:

E/AndroidRuntime(16201): FATAL EXCEPTION: main
E/AndroidRuntime(16201): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.email/com.android.email.activity.setup.AccountSetupBasics}: java.lang.RuntimeException: Binary XML file line #113: You must supply a layout_width attribute.
E/AndroidRuntime(16201):	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2247)
E/AndroidRuntime(16201):	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297)
E/AndroidRuntime(16201):	at android.app.ActivityThread.access$700(ActivityThread.java:152)
E/AndroidRuntime(16201):	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
E/AndroidRuntime(16201):	at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(16201):	at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(16201):	at android.app.ActivityThread.main(ActivityThread.java:5328)
E/AndroidRuntime(16201):	at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(16201):	at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(16201):	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
E/AndroidRuntime(16201):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
E/AndroidRuntime(16201):	at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(16201): Caused by: java.lang.RuntimeException: Binary XML file line #113: You must supply a layout_width attribute.
E/AndroidRuntime(16201):	at android.content.res.TypedArray.getLayoutDimension(TypedArray.java:492)
E/AndroidRuntime(16201):	at android.view.ViewGroup$LayoutParams.setBaseAttributes(ViewGroup.java:5712)
E/AndroidRuntime(16201):	at android.view.ViewGroup$MarginLayoutParams.<init>(ViewGroup.java:5854)
E/AndroidRuntime(16201):	at android.widget.LinearLayout$LayoutParams.<init>(LinearLayout.java:1829)
E/AndroidRuntime(16201):	at android.widget.LinearLayout.generateLayoutParams(LinearLayout.java:1741)
E/AndroidRuntime(16201):	at android.widget.LinearLayout.generateLayoutParams(LinearLayout.java:58)
E/AndroidRuntime(16201):	at android.view.LayoutInflater.rInflate(LayoutInflater.java:759)
E/AndroidRuntime(16201):	at android.view.LayoutInflater.parseInclude(LayoutInflater.java:846)
E/AndroidRuntime(16201):	at android.view.LayoutInflater.rInflate(LayoutInflater.java:742)
E/AndroidRuntime(16201):	at android.view.LayoutInflater.rInflate(LayoutInflater.java:760)
E/AndroidRuntime(16201):	at android.view.LayoutInflater.rInflate(LayoutInflater.java:760)
E/AndroidRuntime(16201):	at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
E/AndroidRuntime(16201):	at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
E/AndroidRuntime(16201):	at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
E/AndroidRuntime(16201):	at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:327)
E/AndroidRuntime(16201):	at android.app.Activity.setContentView(Activity.java:1928)
E/AndroidRuntime(16201):	at com.android.email.activity.setup.AccountSetupBasics.onCreate(AccountSetupBasics.java:805)
E/AndroidRuntime(16201):	at android.app.Activity.performCreate(Activity.java:5250)
E/AndroidRuntime(16201):	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
E/AndroidRuntime(16201):	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
E/AndroidRuntime(16201):	... 11 more
D/qdmemalloc( 215): ion: Mapped buffer base:0x47523000 size:1835008 fd:41
D/qdmemalloc( 215): ion: Mapped buffer base:0x40067000 size:4096 fd:78
D/qdmemalloc( 215): ion: unmap_buffer base:0x0 size:1835008 offset:0 fd:41
D/qdmemalloc( 215): ion: unmap_buffer base:0x0 size:4096 offset:0 fd:78
W/ContextImpl( 1680): Calling a method in the system process without a qualified user: android.app.ContextImpl.sendBroadcast:1337 com.android.server.am.ActivityStack.startPausingLocked:1342 com.android.server.am.ActivityStack.finishActivityLocked:5865 com.android.server.am.ActivityStack.finishActivityLocked:5779 com.android.server.am.ActivityManagerService.handleAppCrashLocked:9428
D/CrashAnrDetector( 1680): processName: com.android.email
D/CrashAnrDetector( 1680): broadcastEvent : com.android.email system_app_crash

Hope it helps. Still have the rest of the logcat if you need more info.