I can4t install Red Hat 7.0, anaconda hangs

Traceback (innermost last):
  File "/usr/bin/anaconda", line 438, in ?
    intf.run(todo, test = test)
  File "/var/tmp/anaconda-7.0.1//usr/lib/anaconda/text.py", line 1030, in 
run
    rc = apply (step[1](), step[2])
  File "/var/tmp/anaconda-7.0.1//usr/lib/anaconda/text.py", line 507, in 
__call__
    if todo.doInstall ():
  File "/var/tmp/anaconda-7.0.1//usr/lib/anaconda/todo.py", line 1480, in 
doInstall
    if self.method.systemMounted (self.fstab, self.instPath, 
self.hdList.selected()):
  File "/var/tmp/anaconda-7.0.1//usr/lib/anaconda/image.py", line 46, in 
systemMounted
    self.loopbackFile = mntPoint + fstab.filesystemSpace(mntPoint)[0][0] + 
\
  File "/var/tmp/anaconda-7.0.1//usr/lib/anaconda/fstab.py", line 258, in 
filesystemSpace
    space.append((mntpoint, isys.fsSpaceAvailable(topMount + '/' + 
mntpoint)))
  File "/usr/lib/anaconda/isys.py", line 16, in fsSpaceAvailable
    return _isys.devSpaceFree(fsystem)
SystemError: (2, 'No existe el fichero o el directorio')

Local variables in innermost frame:
fsystem: /mnt/sysimage//mnt/dos

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

<failed>