anaconda-19.31.77-1: RepoError: database disk image is malformed

Issue

• Installation of Red Hat Enterprise Linux 7 RC fails with the abrt message anaconda-19.31.77-1: RepoError: database disk image is malformed

:The following was filed automatically by anaconda:
:anaconda 19.31.77-1 exception report
:Traceback (most recent call first):
:  File "/usr/lib/python2.7/site-packages/yum/sqlitesack.py", line 55, in newFunc
:    raise Errors.RepoError, str(e)
:  File "/usr/lib/python2.7/site-packages/yum/sqlitesack.py", line 1714, in searchNevra
:    for pkg in self.searchNames(names=[name]):
:  File "/usr/lib/python2.7/site-packages/yum/sqlitesack.py", line 46, in newFunc
:    return func(*args, **kwargs)
:  File "/usr/lib/python2.7/site-packages/yum/packageSack.py", line 595, in _computeAggregateListResult
:    sackResult = apply(method, args)
:  File "/usr/lib/python2.7/site-packages/yum/packageSack.py", line 403, in searchNevra
:    return self._computeAggregateListResult("searchNevra", name, epoch, ver, rel, arch)
:  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 4768, in install
:    ver=nevra_dict['version'], rel=nevra_dict['release'])
:  File "/usr/lib/python2.7/site-packages/yum/__init__.py", line 3890, in selectGroup
:    pkg_warning_level='debug2')
:  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/yumpayload.py", line 1259, in _selectYumGroup
:    self._yum.selectGroup(groupid, group_package_types=pkg_types)
:  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/yumpayload.py", line 1373, in _applyYumSelections
:    self._selectYumGroup("core")
:  File "/usr/lib64/python2.7/site-packages/pyanaconda/packaging/yumpayload.py", line 1477, in checkSoftwareSelection
:    self._applyYumSelections()
:  File "/usr/lib64/python2.7/site-packages/pyanaconda/ui/gui/spokes/software.py", line 104, in checkSoftwareSelection
:    self.payload.checkSoftwareSelection()
:  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 211, in run
:    threading.Thread.run(self, *args, **kwargs)
:RepoError: database disk image is malformed