It happens with me too (using Yosemite)
The log is:
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: @(#)PROGRAM:Install PROJECT:Install-920
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: @(#)PROGRAM:IA PROJECT:InstallAssistant-532
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: Hardware: Macmini6,1 @ 2.50 GHz (x 4), 4096 MB RAM
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: Running OS Build: Mac OS X 10.10.1 (14B25)
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: Env: PATH=/usr/bin:/bin:/usr/sbin:/sbin
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: Env: PWD=/
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: Env: XPC_FLAGS=0x0
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: Env: XPC_SERVICE_NAME=0
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: Env: SHLVL=1
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: Env: __OSINSTALL_ENVIRONMENT=1
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: Env: CI_DEFAULT_OPENCL_USAGE=0
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: Env: OS_INSTALL=1
Jan 26 14:58:22 Mac-mini.home InstallAssistant[418]: Env: _=/System/Library/CoreServices/Language Chooser.app/Contents/MacOS/Language Chooser
Jan 26 14:58:24 Mac-mini.home InstallAssistant[418]: Can not connect to /var/run/systemkeychaincheck.socket: No such file or directory
Jan 26 14:58:24 Mac-mini.home InstallAssistant[418]: Using distribution archive from /Volumes/Install OS X Yosemite/Install OS X Yosemite.app/Contents/SharedSupport/OSInstall.mpkg
Jan 26 14:58:24 Mac-mini.home Unknown[396]: 2015-01-26 14:58:24.267 InstallAssistant[418:15366] Failed to connect (keyReceivingView) outlet from (IASetupWindowController) to (PUKDiskPickerHorizontalView): missing setter or instance variable
Jan 26 14:58:24 Mac-mini.home Unknown[396]: 2015-01-26 14:58:24.267 InstallAssistant[418:15366] Failed to connect (loadingDistProgress) outlet from (IASetupWindowController) to (NSProgressIndicator): missing setter or instance variable
Jan 26 14:58:24 Mac-mini.home Unknown[396]: 2015-01-26 14:58:24.268 InstallAssistant[418:15366] Failed to connect (loadingDistView) outlet from (IASetupWindowController) to (NSView): missing setter or instance variable
Jan 26 14:58:24 Mac-mini.home Unknown[396]: 2015-01-26 14:58:24.268 InstallAssistant[418:15366] Failed to connect (subtitle) outlet from (IASetupWindowController) to (NSTextField): missing setter or instance variable
Jan 26 14:58:24 Mac-mini.home Unknown[396]: 2015-01-26 14:58:24.268 InstallAssistant[418:15366] Failed to connect (keyReceivingView) outlet from (IAContentView) to (PUKDiskPickerHorizontalView): missing setter or instance variable
Jan 26 14:58:26 Mac-mini.home InstallAssistant[418]: Configuring products from SharedSupport folder
Jan 26 14:58:26 Mac-mini.home InstallAssistant[418]: Install is double-dmg. Not adding chunklist to download list.
Jan 26 14:58:26 Mac-mini.home InstallAssistant[418]: Using product <OSInstallDVDProduct> based on media at /Volumes/Install OS X Yosemite/Install OS X Yosemite.app/Contents/SharedSupport at distance 5
Jan 26 14:58:26 Mac-mini.home InstallAssistant[418]: Using product <OSInstallESDProduct> based on distribution at /Volumes/Install OS X Yosemite/Install OS X Yosemite.app/Contents/SharedSupport/OSInstall.mpkg at distance 5
Jan 26 14:58:26 Mac-mini.home InstallAssistant[418]: Checking Software Update catalog URL https://swscan.apple.com/content/catalogs/others/index-10.10-10.9-mountainlion-l ion-snowleopard-leopard.merged-1.sucatalog
Jan 26 14:58:26 Mac-mini.home Unknown[396]: 2015-01-26 14:58:26.322 InstallAssistant[418:15391] ***storageTaskManagerExistsWithIdentifier:withIdentifier failed: Error Domain=NSCocoaErrorDomain Code=4099 "Não foi possível comunicar com um aplicativo auxiliar." (The connection to service named com.apple.nsurlstorage-cache was invalidated.) UserInfo=0x7fc5fb72d590 {NSDebugDescription=The connection to service named com.apple.nsurlstorage-cache was invalidated.}; {
Jan 26 14:58:26 Mac-mini.home Unknown[396]: NSDebugDescription = "The connection to service named com.apple.nsurlstorage-cache was invalidated.";
Jan 26 14:58:26 Mac-mini.home Unknown[396]: }
Jan 26 14:58:26 Mac-mini.home Unknown[396]: 2015-01-26 14:58:26.325 InstallAssistant[418:15371] ***cachedResponseForRequest:key:handler failed: Error Domain=NSCocoaErrorDomain Code=4099 "Não foi possível comunicar com um aplicativo auxiliar." (The connection to service named com.apple.nsurlstorage-cache was invalidated.) UserInfo=0x7fc5fdd45e60 {NSDebugDescription=The connection to service named com.apple.nsurlstorage-cache was invalidated.}; {
Jan 26 14:58:26 Mac-mini.home Unknown[396]: NSDebugDescription = "The connection to service named com.apple.nsurlstorage-cache was invalidated.";
Jan 26 14:58:26 Mac-mini.home Unknown[396]: }
Jan 26 14:58:26 Mac-mini.home InstallAssistant[418]: No available package ref for compatibility update. Ignoring.
Jan 26 14:58:26 Mac-mini.home InstallAssistant[418]: No available package ref for compatibility update. Ignoring.
Jan 26 14:58:26 Mac-mini.home InstallAssistant[418]: GetDYLDEntryPointWithImage(/System/Library/PrivateFrameworks/CacheDelete.framew ork/CacheDelete,CacheDeleteCopyPurgeableSpaceWithInfo) failed.
Jan 26 14:58:29 Mac-mini.home InstallAssistant[418]: Using product <OSSoftwareUpdateCatalogProduct> from product keys (null) at distance 25
Jan 26 14:58:31 Mac-mini.home InstallAssistant[418]: LSExceptions [0x7fc5fb503830] unloaded
Jan 26 14:58:34 Mac-mini.home InstallAssistant[418]: Created IATool object:fd936080
Jan 26 14:58:44 Mac-mini.home InstallAssistant[418]: Preventing machine sleep.
Jan 26 14:58:45 Mac-mini.home InstallAssistant[418]: Using product IA_PKSecureNetEnabledProduct <file:///Volumes/SSD/OS%20X%20Install%20Data/> at distance 5
Jan 26 14:58:45 Mac-mini.home InstallAssistant[418]: Using existing boot files dir at /Volumes/Install OS X Yosemite/.IABootFiles
Jan 26 14:58:45 Mac-mini.home InstallAssistant[418]: Using mutable product path: /Volumes/SSD/OS X Install Data
Jan 26 14:58:45 Mac-mini.home InstallAssistant[418]: Using boot files path: /Volumes/Install OS X Yosemite/.IABootFiles
Jan 26 14:58:45 Mac-mini.home InstallAssistant[418]: LSExceptions [0x7fc5fea55050] loaded
Jan 26 14:58:45 Mac-mini.home InstallAssistant[418]: Retrieving 1 packages (0.000 GB)
Jan 26 14:58:46 Mac-mini.home InstallAssistant[418]: Retrieved package com.apple.pkg.CompatibilityUpdate (http://swcdn.apple.com/content/downloads/23/51/031-11169/a9tr6akb5mrtqj60w56cdqx hebmhlbrbwn/OSX_10_10_IncompatibleAppList.pkg)
Jan 26 14:58:49 Mac-mini.home InstallAssistant[418]: Verifying InstallMacOSX.pkg/InstallESD.dmg
Jan 26 14:58:55 Mac-mini.home InstallAssistant[418]: LSExceptions [0x7fc5fea55050] unloaded
Jan 26 15:09:52 Mac-mini.home configd[113]: network changed: v4(en1:192.168.1.42) DNS* Proxy SMB
Jan 26 15:09:54 Mac-mini.home configd[113]: network changed.
Jan 26 15:18:08 Mac-mini.home InstallAssistant[418]: Finished operation queue
Jan 26 15:18:08 Mac-mini.home InstallAssistant[418]: Opening /Volumes/Install OS X Yosemite/Install OS X Yosemite.app/Contents/SharedSupport/InstallESD.dmg
Jan 26 15:18:09 Mac-mini.home InstallAssistant[418]: Extracting boot files from /Volumes/OS X Install ESD/BaseSystem.dmg
Jan 26 15:18:11 Mac-mini.home InstallAssistant[418]: Extracting Boot Bits from Inner DMG:
Jan 26 15:18:12 Mac-mini.home InstallAssistant[418]: Copied kernelcache
Jan 26 15:18:13 Mac-mini.home InstallAssistant[418]: Copied Boot.efi
Jan 26 15:18:13 Mac-mini.home InstallAssistant[418]: Copied PlatformSupport.plist
Jan 26 15:18:13 Mac-mini.home InstallAssistant[418]: Ejecting disk images
Jan 26 15:18:14 Mac-mini.home InstallAssistant[418]: Generating the com.apple.Boot.plist file
Jan 26 15:18:14 Mac-mini.home InstallAssistant[418]: com.apple.Boot.plist: {
"Kernel Cache" = "/.IABootFiles/kernelcache";
"Kernel Flags" = "container-dmg=file:///Install%20OS%20X%20Yosemite.app/Contents/SharedSupport/I nstallESD.dmg root-dmg=file:///BaseSystem.dmg";
}
Jan 26 15:18:14 Mac-mini.home InstallAssistant[418]: Done generating the com.apple.Boot.plist file
Jan 26 15:18:14 Mac-mini.home InstallAssistant[418]: Blessing /Volumes/Install OS X Yosemite -- /Volumes/Install OS X Yosemite/.IABootFiles
Jan 26 15:18:14 Mac-mini.home InstallAssistant[418]: Blessing Mount Point:/Volumes/Install OS X Yosemite Folder:/Volumes/Install OS X Yosemite/.IABootFiles plist:com.apple.Boot.plist
Jan 26 15:18:14 Mac-mini.home InstallAssistant[418]: ***************************** Setting Startup Disk *****************************
Jan 26 15:18:14 Mac-mini.home InstallAssistant[418]: ****** Path: /Volumes/Install OS X Yosemite
Jan 26 15:18:14 Mac-mini.home InstallAssistant[418]: ****** Boot Plist: /Volumes/Install OS X Yosemite/.IABootFiles/com.apple.Boot.plist
Jan 26 15:18:14 Mac-mini.home InstallAssistant[418]: /usr/sbin/bless -setBoot -folder /Volumes/Install OS X Yosemite/.IABootFiles -bootefi /Volumes/Install OS X Yosemite/.IABootFiles/boot.efi -options config="\.IABootFiles\com.apple.Boot" -label OS X Installer
Jan 26 15:18:14 Mac-mini.home InstallAssistant[418]: Bless on /Volumes/Install OS X Yosemite succeeded
Jan 26 15:19:57 Mac-mini.home InstallAssistant[418]: Got error in writing to /Volumes/SSD/OS X Install Data/minstallconfig.xml