[General Questions and Answers] SilntExecutnr:
This is the log file from FX File Explorer. 05-20 19:30:28.365 is where the error starts.

Android SDK: 21

Board: MSM8974

Build ID: LRX21V.N900AUCUEOC1

CPU: armeabi-v7a

Device: hlteatt

Fingerprint: samsung/hlteuc/hlteatt:5.0/LRX21V/N900AUCUEOC1:user/release-keys

Manufacturer: samsung

Model: SAMSUNG-SM-N900A

Product: hlteuc

Tags: release-keys

___________________

Error Log @ Fri May 20 19:30:37 CDT 2016: logcat -v threadtime -t 1000 -s nextapp.maui -s nextapp.fx -s AndroidRuntime -s dalvikvm

--------- beginning of system

--------- beginning of main

05-20 19:29:32.275 6795 6795 D nextapp.maui: found:/storage/emulated/0

05-20 19:29:32.275 6795 6795 D nextapp.maui: found:/storage/extSdCard

05-20 19:29:33.565 6795 6795 D nextapp.maui: found:/storage/emulated/0

05-20 19:29:33.565 6795 6795 D nextapp.maui: found:/storage/extSdCard

05-20 19:29:44.295 6795 6795 D nextapp.maui: found:/storage/emulated/0

05-20 19:29:44.295 6795 6795 D nextapp.maui: found:/storage/extSdCard

05-20 19:29:45.555 6795 6795 D nextapp.maui: found:/storage/emulated/0

05-20 19:29:45.555 6795 6795 D nextapp.maui: found:/storage/extSdCard

05-20 19:30:00.715 6795 6795 D nextapp.maui: found:/storage/emulated/0

05-20 19:30:00.715 6795 6795 D nextapp.maui: found:/storage/extSdCard

05-20 19:30:03.335 6795 6795 D nextapp.maui: found:/storage/emulated/0

05-20 19:30:03.335 6795 6795 D nextapp.maui: found:/storage/extSdCard

05-20 19:30:14.085 6795 6795 D nextapp.maui: found:/storage/emulated/0

05-20 19:30:14.085 6795 6795 D nextapp.maui: found:/storage/extSdCard

05-20 19:30:17.535 6795 6795 D nextapp.maui: found:/storage/emulated/0

05-20 19:30:17.535 6795 6795 D nextapp.maui: found:/storage/extSdCard

05-20 19:30:22.055 6795 6795 D nextapp.maui: found:/storage/emulated/0

05-20 19:30:22.055 6795 6795 D nextapp.maui: found:/storage/extSdCard

05-20 19:30:23.575 6795 6795 D nextapp.maui: found:/storage/emulated/0

05-20 19:30:23.575 6795 6795 D nextapp.maui: found:/storage/extSdCard

05-20 19:30:28.365 6795 12655 D nextapp.fx: Error removing partial file: Media Card/Download/13263869_10204654477881281_618831981940619113_n.jpg

05-20 19:30:28.365 6795 12655 D nextapp.fx: nextapp.fx.ak: NO_ACCESS_WRITE_SECONDARY_STORAGE_SAF

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.fx.dir.file.j.b(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.fx.dir.file.j.b(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.fx.dir.a.a(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.fx.dir.file.f.a(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.fx.dir.bw.a(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.fx.dir.cm.a(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.fx.dir.bw.a(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.fx.dir.bw.a(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.fx.dir.bw.a(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.fx.dir.bw.a(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.fx.dir.ck.run(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.maui.k.d.a(Unknown Source)

05-20 19:30:28.365 6795 12655 D nextapp.fx:	at nextapp.maui.k.d.run(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx: Operation failed.

05-20 19:30:28.365 6795 12636 D nextapp.fx: nextapp.fx.operation.h: nextapp.fx.ak: NO_ACCESS_WRITE_SECONDARY_STORAGE_SAF

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.dir.ch.b(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.operation.a.a(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.operation.a.b(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.operation.n.run(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at java.lang.Thread.run(Thread.java:818)

05-20 19:30:28.365 6795 12636 D nextapp.fx: Caused by: nextapp.fx.ak: NO_ACCESS_WRITE_SECONDARY_STORAGE_SAF

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.dir.file.f.a(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.dir.file.f.a(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.dir.bw.a(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.dir.bw.a(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.dir.bw.a(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.dir.bw.a(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.dir.ck.run(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.maui.k.d.a(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.maui.k.d.run(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx: Caused by: java.io.FileNotFoundException: /storage/extSdCard/Download/13263869_10204654477881281_618831981940619113_n.jpg: open failed: EROFS (Read-only file system)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at libcore.io.IoBridge.open(IoBridge.java:456)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at java.io.FileOutputStream.<init>(FileOutputStream.java:87)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at nextapp.fx.dir.file.h.<init>(Unknown Source)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	... 9 more

05-20 19:30:28.365 6795 12636 D nextapp.fx: Caused by: android.system.ErrnoException: open failed: EROFS (Read-only file system)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at libcore.io.Posix.open(Native Method)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	at libcore.io.IoBridge.open(IoBridge.java:442)

05-20 19:30:28.365 6795 12636 D nextapp.fx:	... 11 more