install shield 问题Error 7 -1007

Error   7   -1007: Cannot copy source 'C:\Program Files (x86)\InstallShield12SpringLE\SetupPrerequisites\Windows Installer.1\x86\WindowsInstaller-KB893803-v2-x86.exe' to target 'C:\Users\Erik\myProject\Server Install\Express\SingleImage\DiskImages\DISK1\ISSetupPrerequisites\{57bcd1d4-2de9-49d9-bc0c-3f4263e9970e}\WindowsInstaller-KB893803-v2-x86.exe'    ISEXP : error : -1007: Cannot copy source 'C:\Program Files (x86)\InstallShield12SpringLE\SetupPrerequisites\Windows Installer.1\x86\WindowsInstaller-KB893803-v2-x86.exe' to target 'C:\Users\Erik\myProject\Server Install\Express\SingleImage\DiskImages\DISK1\ISSetupPrerequisites\{57bcd1d4-2de9-49d9-bc0c-3f4263e9970e}\WindowsInstaller-KB893803-v2-x86.exe'Error   7   -1007: Cannot copy source 'C:\Pr