Confused why these errors are happening, and what they mean?

Question

I'm messing around with DBFlow in a android app trying to learn the framework a bit, and I've started getting errors, though I'm not sure they are related to DBFlow.

Here is the error messages:

01-12 06:49:43.817 1294-1310/? E/BluetoothAdapter: Bluetooth binder is null
01-12 06:49:43.818 1294-1310/? E/KernelCpuSpeedReader: Failed to read cpu-freq
                                                       java.io.FileNotFoundException: /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state: open failed: ENOENT (No such file or directory)
                                                           at libcore.io.IoBridge.open(IoBridge.java:452)
                                                           at java.io.FileInputStream.<init>(FileInputStream.java:76)
                                                           at java.io.FileInputStream.<init>(FileInputStream.java:103)
                                                           at java.io.FileReader.<init>(FileReader.java:66)
                                                           at com.android.internal.os.KernelCpuSpeedReader.readDelta(KernelCpuSpeedReader.java:49)
                                                           at com.android.internal.os.BatteryStatsImpl.updateCpuTimeLocked(BatteryStatsImpl.java:8002)
                                                           at com.android.server.am.BatteryStatsService.updateExternalStats(BatteryStatsService.java:1366)
                                                           at com.android.server.am.BatteryStatsService$BatteryStatsHandler.handleMessage(BatteryStatsService.java:125)
                                                           at android.os.Handler.dispatchMessage(Handler.java:102)
                                                           at android.os.Looper.loop(Looper.java:148)
                                                           at android.os.HandlerThread.run(HandlerThread.java:61)
                                                           at com.android.server.ServiceThread.run(ServiceThread.java:46)
                                                        Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
                                                           at libcore.io.Posix.open(Native Method)
                                                           at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
                                                           at libcore.io.IoBridge.open(IoBridge.java:438)
                                                           at java.io.FileInputStream.<init>(FileInputStream.java:76) 
                                                           at java.io.FileInputStream.<init>(FileInputStream.java:103) 
                                                           at java.io.FileReader.<init>(FileReader.java:66) 
                                                           at com.android.internal.os.KernelCpuSpeedReader.readDelta(KernelCpuSpeedReader.java:49) 
                                                           at com.android.internal.os.BatteryStatsImpl.updateCpuTimeLocked(BatteryStatsImpl.java:8002) 
                                                           at com.android.server.am.BatteryStatsService.updateExternalStats(BatteryStatsService.java:1366) 
                                                           at com.android.server.am.BatteryStatsService$BatteryStatsHandler.handleMessage(BatteryStatsService.java:125) 
                                                           at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                           at android.os.Looper.loop(Looper.java:148) 
                                                           at android.os.HandlerThread.run(HandlerThread.java:61) 
                                                           at com.android.server.ServiceThread.run(ServiceThread.java:46) 
01-12 06:49:43.818 1294-1310/? E/KernelUidCpuTimeReader: Failed to read uid_cputime
                                                         java.io.FileNotFoundException: /proc/uid_cputime/show_uid_stat: open failed: ENOENT (No such file or directory)
                                                             at libcore.io.IoBridge.open(IoBridge.java:452)
                                                             at java.io.FileInputStream.<init>(FileInputStream.java:76)
                                                             at java.io.FileInputStream.<init>(FileInputStream.java:103)
                                                             at java.io.FileReader.<init>(FileReader.java:66)
                                                             at com.android.internal.os.KernelUidCpuTimeReader.readDelta(KernelUidCpuTimeReader.java:71)
                                                             at com.android.internal.os.BatteryStatsImpl.updateCpuTimeLocked(BatteryStatsImpl.java:8031)
                                                             at com.android.server.am.BatteryStatsService.updateExternalStats(BatteryStatsService.java:1366)
                                                             at com.android.server.am.BatteryStatsService$BatteryStatsHandler.handleMessage(BatteryStatsService.java:125)
                                                             at android.os.Handler.dispatchMessage(Handler.java:102)
                                                             at android.os.Looper.loop(Looper.java:148)
                                                             at android.os.HandlerThread.run(HandlerThread.java:61)
                                                             at com.android.server.ServiceThread.run(ServiceThread.java:46)
                                                          Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
                                                             at libcore.io.Posix.open(Native Method)
                                                             at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
                                                             at libcore.io.IoBridge.open(IoBridge.java:438)
                                                             at java.io.FileInputStream.<init>(FileInputStream.java:76) 
                                                             at java.io.FileInputStream.<init>(FileInputStream.java:103) 
                                                             at java.io.FileReader.<init>(FileReader.java:66) 
                                                             at com.android.internal.os.KernelUidCpuTimeReader.readDelta(KernelUidCpuTimeReader.java:71) 
                                                             at com.android.internal.os.BatteryStatsImpl.updateCpuTimeLocked(BatteryStatsImpl.java:8031) 
                                                             at com.android.server.am.BatteryStatsService.updateExternalStats(BatteryStatsService.java:1366) 
                                                             at com.android.server.am.BatteryStatsService$BatteryStatsHandler.handleMessage(BatteryStatsService.java:125) 
                                                             at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                             at android.os.Looper.loop(Looper.java:148) 
                                                             at android.os.HandlerThread.run(HandlerThread.java:61) 
                                                             at com.android.server.ServiceThread.run(ServiceThread.java:46)

I'm pretty new to Android development and confused why they are occurring. It is not crashing my application, and doesn't appear to happen every single time.

By the way, I'm using the Nexus 5 Emulator to run this, so maybe it's related to that? Usually errors are bad, so I'm assuming this is something to be concerned with, regardless of it not appearing to effect the app...?

Answer 1

Maybe you need permision read/write Files

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>