title: CLSAnalyticsController transmitPackagedSessionFragments generated NSInternalInconsistencyException
body: <p>I received a crash report <em>NSInternalInconsistencyException</em> in the <em>FABMultipartMimeStreamEncoder addFileData</em>, which was called by <em>CLSAnalyticsController transmitPackagedSessionFragments</em>.</p>
  
  <p>I followed all the instructions about including Crashlytics into the project, but still received this crash report form one of the test users.</p>
  
  <p>Stack info is below.</p>
  
  <p>Thanks</p>
  
  <pre><code>Thread : Fatal Exception: NSInternalInconsistencyException
  0  CoreFoundation                 0x0000000184184f5c __exceptionPreprocess
  1  libobjc.A.dylib                0x0000000198d7bf80 objc_exception_throw
  2  CoreFoundation                 0x0000000184184e2c +[NSException raise:format:]
  3  Foundation                     0x0000000185073f3c -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:]
  4  MyApp                         0x00000001001bab0c -[FABMultipartMimeStreamEncoder addFileData:fileName:mimeType:fieldName:]
  5  MyApp                         0x00000001001bae14 -[FABMultipartMimeStreamEncoder addFile:fileName:mimeType:fieldName:]
  6  MyApp                         0x00000001001a93ac __74-[CLSAnalyticsNetworkingClient requestForLogFilesAtURLs:toURL:withAPIKey:]_block_invoke
  7  MyApp                         0x00000001001ba5f8 -[FABMultipartMimeStreamEncoder encode:]
  8  MyApp                         0x00000001001ba274 +[FABMultipartMimeStreamEncoder populateRequest:withDataFromEncoder:]
  9  MyApp                         0x00000001001a9268 -[CLSAnalyticsNetworkingClient requestForLogFilesAtURLs:toURL:withAPIKey:]
  10 MyApp                         0x00000001001a8f70 -[CLSAnalyticsNetworkingClient transmitLogFilesAtURLs:toURL:withAPIKey:completionHandler:]
  11 MyApp                         0x00000001001a6168 -[CLSAnalyticsController transmitNextPackagedSessionFragment:]
  12 MyApp                         0x00000001001a656c __59-[CLSAnalyticsController transmitPackagedSessionFragments:]_block_invoke
  13 libdispatch.dylib              0x00000001995757b0 _dispatch_call_block_and_release
  14 libdispatch.dylib              0x0000000199575770 _dispatch_client_callout
  15 libdispatch.dylib              0x000000019958175c _dispatch_queue_drain
  16 libdispatch.dylib              0x0000000199579274 _dispatch_queue_invoke
  17 libdispatch.dylib              0x000000019958362c _dispatch_root_queue_drain
  18 libdispatch.dylib              0x000000019958334c _dispatch_worker_thread3
  19 libsystem_pthread.dylib        0x0000000199789478 _pthread_wqthread
  20 libsystem_pthread.dylib        0x0000000199789028 start_wqthread
  </code></pre>