Description of problem:
anaconda crash on first windowm with unknow error.

Version-Release number of selected component:
anaconda-20.25.6-1

The following was filed automatically by anaconda:
anaconda 20.25.6-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/size.py", line 100, in _parseSpec
    raise ValueError("invalid size specification", spec)
  File "/usr/lib/python2.7/site-packages/blivet/size.py", line 138, in __new__
    self = Decimal.__new__(cls, value=_parseSpec(spec))
  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/yumpayload.py", line 196, in reset
    self._space_required = Size(spec="3000 MB")
  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/yumpayload.py", line 513, in updateBaseRepo
    self.reset(root=root)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/yumpayload.py", line 140, in inner_method
    return method(yum_payload, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/yumpayload.py", line 209, in setup
    self.updateBaseRepo(fallback=not flags.automatedInstall)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/__init__.py", line 906, in payloadInitialize
    payload.setup(storage)
  File "/usr/lib64/python2.7/threading.py", line 764, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 168, in run
    threading.Thread.run(self, *args, **kwargs)
ValueError: ('invalid size specification', '3000 MB')

Additional info:
cmdline:        /usr/bin/python  /sbin/anaconda
cmdline_file:   initrd=initrd.img inst.stage2=hd:LABEL=Fedora\x2020-Beta\x20x86_64 quiet BOOT_IMAGE=vmlinuz 
executable:     /sbin/anaconda
hashmarkername: anaconda
kernel:         3.11.6-301.fc20.x86_64
product:        Fedora
release:        Cannot get release name.
type:           anaconda
version:        20-Beta