                         startTime = kCMTimeZero
                         _readers.append(assetreader)
                     } else {
-                        NSLog("Failed to instantiate a AssetReaderFragment.")
+                        NSLog("2) Failed to instantiate a reader of [\((target_asset as AVURLAsset).URL.lastPathComponent!)]")
                         break outer
                     }
                 }

                if let assetreader = AssetReaderFragment(asset:asset) {
                    self._readers.append(assetreader)
                } else {
                    NSLog("Failed to instantiate a AssetReaderFragment.")
                }
            }
        }

                startTime = kCMTimeZero
                _readers.append(assetreader)
            } else {
                NSLog("1) Failed to instantiate a reader of [\((_assets[startIndex] as AVURLAsset).URL.lastPathComponent!)]")
            }
        }

