error trace

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
//anaconda/lib/python2.7/site-packages/IPython/core/formatters.pyc in __call__(self, obj)
    693                 type_pprinters=self.type_printers,
    694                 deferred_pprinters=self.deferred_printers)
--> 695             printer.pretty(obj)
    696             printer.flush()
    697             return stream.getvalue()

//anaconda/lib/python2.7/site-packages/IPython/lib/pretty.pyc in pretty(self, obj)
    399                             if callable(meth):
    400                                 return meth(obj, self, cycle)
--> 401             return _default_pprint(obj, self, cycle)
    402         finally:
    403             self.end_group()

//anaconda/lib/python2.7/site-packages/IPython/lib/pretty.pyc in _default_pprint(obj, p, cycle)
    519     if _safe_getattr(klass, '__repr__', None) not in _baseclass_reprs:
    520         # A user-provided repr. Find newlines and replace them with p.break_()
--> 521         _repr_pprint(obj, p, cycle)
    522         return
    523     p.begin_group(1, '<')

//anaconda/lib/python2.7/site-packages/IPython/lib/pretty.pyc in _repr_pprint(obj, p, cycle)
    701     """A pprint that just redirects to the normal repr function."""
    702     # Find newlines and replace them with p.break_()
--> 703     output = repr(obj)
    704     for idx,output_line in enumerate(output.splitlines()):
    705         if idx:

//anaconda/lib/python2.7/site-packages/pandas/core/base.pyc in __repr__(self)
     63         Yields Bytestring in Py2, Unicode String in py3.
     64         """
---> 65         return str(self)
     66
     67

//anaconda/lib/python2.7/site-packages/pandas/core/base.pyc in __str__(self)
     43         if compat.PY3:
     44             return self.__unicode__()
---> 45         return self.__bytes__()
     46
     47     def __bytes__(self):

//anaconda/lib/python2.7/site-packages/pandas/core/base.pyc in __bytes__(self)
     55
     56         encoding = get_option("display.encoding")
---> 57         return self.__unicode__().encode(encoding, 'replace')
     58
     59     def __repr__(self):

//anaconda/lib/python2.7/site-packages/pandas/core/frame.pyc in __unicode__(self)
    494             width = None
    495         self.to_string(buf=buf, max_rows=max_rows, max_cols=max_cols,
--> 496                        line_width=width, show_dimensions=show_dimensions)
    497
    498         return buf.getvalue()

//anaconda/lib/python2.7/site-packages/pandas/core/frame.pyc in to_string(self, buf, columns, col_space, colSpace, header, index, na_rep, formatters, float_format, sparsify, index_names, justify, line_width, max_rows, max_cols, show_dimensions)
   1327                                            max_cols=max_cols,
   1328                                            show_dimensions=show_dimensions)
-> 1329         formatter.to_string()
   1330
   1331         if buf is None:

//anaconda/lib/python2.7/site-packages/pandas/core/format.pyc in to_string(self)
    482             text = info_line
    483         else:
--> 484             strcols = self._to_str_columns()
    485             if self.line_width is None:  # no need to wrap around just print the whole frame
    486                 text = adjoin(1, *strcols)

//anaconda/lib/python2.7/site-packages/pandas/core/format.pyc in _to_str_columns(self)
    410                                    *(_strlen(x) for x in cheader))
    411
--> 412                 fmt_values = self._format_col(i)
    413
    414                 fmt_values = _make_fixed_width(fmt_values, self.justify,

//anaconda/lib/python2.7/site-packages/pandas/core/format.pyc in _format_col(self, i)
    658         formatter = self._get_formatter(i)
    659         return format_array(
--> 660             (frame.iloc[:, i]).get_values(),
    661             formatter, float_format=self.float_format, na_rep=self.na_rep,
    662             space=self.col_space

//anaconda/lib/python2.7/site-packages/pandas/sparse/series.pyc in get_values(self)
    220     def get_values(self):
    221         """ same as values """
--> 222         return self._data._values.to_dense().view()
    223
    224     @property

AttributeError: 'SingleBlockManager' object has no attribute 'to_dense'

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
//anaconda/lib/python2.7/site-packages/IPython/core/formatters.pyc in __call__(self, obj)
    337             method = _safe_get_formatter_method(obj, self.print_method)
    338             if method is not None:
--> 339                 return method()
    340             return None
    341         else:

//anaconda/lib/python2.7/site-packages/pandas/core/frame.pyc in _repr_html_(self)
    529                     'max-width:1500px;overflow:auto;">\n' +
    530                     self.to_html(max_rows=max_rows, max_cols=max_cols,
--> 531                                  show_dimensions=show_dimensions) + '\n</div>')
    532         else:
    533             return None

//anaconda/lib/python2.7/site-packages/pandas/core/frame.pyc in to_html(self, buf, columns, col_space, colSpace, header, index, na_rep, formatters, float_format, sparsify, index_names, justify, bold_rows, classes, escape, max_rows, max_cols, show_dimensions)
   1377                                            max_cols=max_cols,
   1378                                            show_dimensions=show_dimensions)
-> 1379         formatter.to_html(classes=classes)
   1380
   1381         if buf is None:

//anaconda/lib/python2.7/site-packages/pandas/core/format.pyc in to_html(self, classes)
    671                                       max_cols=self.max_cols)
    672         if hasattr(self.buf, 'write'):
--> 673             html_renderer.write_result(self.buf)
    674         elif isinstance(self.buf, compat.string_types):
    675             with open(self.buf, 'w') as f:

//anaconda/lib/python2.7/site-packages/pandas/core/format.pyc in write_result(self, buf)
    863         indent += self.indent_delta
    864         indent = self._write_header(indent)
--> 865         indent = self._write_body(indent)
    866
    867         self.write('</table>', indent)

//anaconda/lib/python2.7/site-packages/pandas/core/format.pyc in _write_body(self, indent)
   1007         fmt_values = {}
   1008         for i in range(min(len(self.columns), self.max_cols)):
-> 1009             fmt_values[i] = self.fmt._format_col(i)
   1010
   1011         # write values

//anaconda/lib/python2.7/site-packages/pandas/core/format.pyc in _format_col(self, i)
    658         formatter = self._get_formatter(i)
    659         return format_array(
--> 660             (frame.iloc[:, i]).get_values(),
    661             formatter, float_format=self.float_format, na_rep=self.na_rep,
    662             space=self.col_space

//anaconda/lib/python2.7/site-packages/pandas/sparse/series.pyc in get_values(self)
    220     def get_values(self):
    221         """ same as values """
--> 222         return self._data._values.to_dense().view()
    223
    224     @property

AttributeError: 'SingleBlockManager' object has no attribute 'to_dense'