I tried to install RC1 by custom/everything from CDROM, but failed.Before installing packages, everything is OK: X was 
properly running, mouse, keyboard, partition set, ...

Dump error message:

Traceback (innermost last):
  File "/var/tmp/anaconda-7.0//usr/lib/anaconda/iw/progress_gui.py", line 19, in run
    rc = self.todo.doInstall ()
  File "/var/tmp/anaconda-7.0//usr/lib/anaconda/todo.py", line 1464, in doInstall
    if self.method.systemMounted (self.fstab, self.instPath, self.hdList.selected()):
  File "/var/tmp/anaconda-7.0//usr/lib/anaconda/image.py", line 46, in systemMounted
    self.loopbackFile = mntPoint + fstab.filesystemSpace()[0][0] + \
  File "/var/tmp/anaconda-7.0//usr/lib/anaconda/fstab.py", line 247, in filesystemSpace
    space[mntpoint] = isys.fsSpaceAvailable(mntpoint)
  File "/usr/lib/anaconda/isys.py", line 16, in fsSpaceAvailable
    return _isys.devSpaceFree(fsystem)
SystemError: (2, 'No such file or directory')

Local variables in innermost frame:
fsystem: /boot

ToDo object:
(itodo
ToDo
p1
(dp2
S'method'
p3
(iimage
CdromInstallMethod
p4
(dp5
S'progressWindow'
p6