OSError: No SIMPLE card found, this file does not appear to be a valid FITS file

[MeArpanGhosh]

Hi,
I am facing this problem while I am trying to replicate the quickstart eleanor tutuorial ( https://eleanor.readthedocs.io/en/latest/getting_started/tutorial.html )

In [28]: data = eleanor.TargetData(star, height=15, width=15, bkg_size=31, do_psf=False, do_pca=False)

OSError Traceback (most recent call last)
in
----> 1 data = eleanor.TargetData(star, height=15, width=15, bkg_size=31, do_psf=False, do_pca=False)

~/eleanor/eleanor/targetdata.py in init(self, source, height, width, save_postcard, do_pca, do_psf, bkg_size, aperture_mode, cal_cadences, try_load, regressors, language)
187 if source.tc == False:
188 self.post_obj = Postcard(source.postcard, source.postcard_bkg,
--> 189 source.postcard_path)
190 else:
191 self.post_obj = Postcard_tesscut(source.cutout)

~/eleanor/eleanor/postcard.py in init(self, filename, background, filepath)
56 self.filename = os.path.join(filepath, filename)
57 self.local_path = copy.copy(self.filename)
---> 58 self.hdu = fits.open(self.local_path)
59 self.background2d = fits.open(os.path.join(filepath, background))[1].data
60

~/anaconda3/envs/tess/lib/python3.7/site-packages/astropy/io/fits/hdu/hdulist.py in fitsopen(name, mode, memmap, save_backup, cache, lazy_load_hdus, ignore_missing_simple, **kwargs)
172
173 return HDUList.fromfile(name, mode, memmap, save_backup, cache,
--> 174 lazy_load_hdus, ignore_missing_simple, **kwargs)
175
176

~/anaconda3/envs/tess/lib/python3.7/site-packages/astropy/io/fits/hdu/hdulist.py in fromfile(cls, fileobj, mode, memmap, save_backup, cache, lazy_load_hdus, ignore_missing_simple, **kwargs)
409 save_backup=save_backup, cache=cache,
410 ignore_missing_simple=ignore_missing_simple,
--> 411 lazy_load_hdus=lazy_load_hdus, **kwargs)
412
413 @classmethod

~/anaconda3/envs/tess/lib/python3.7/site-packages/astropy/io/fits/hdu/hdulist.py in _readfrom(cls, fileobj, data, mode, memmap, cache, lazy_load_hdus, ignore_missing_simple, **kwargs)
1088 if hdulist._file.close_on_error:
1089 hdulist._file.close()
-> 1090 raise OSError('No SIMPLE card found, this file does not '
1091 'appear to be a valid FITS file')
1092

OSError: No SIMPLE card found, this file does not appear to be a valid FITS file

In [29]: data = eleanor.TargetData(star)

OSError Traceback (most recent call last)
in
----> 1 data = eleanor.TargetData(star)

~/eleanor/eleanor/targetdata.py in init(self, source, height, width, save_postcard, do_pca, do_psf, bkg_size, aperture_mode, cal_cadences, try_load, regressors, language)
187 if source.tc == False:
188 self.post_obj = Postcard(source.postcard, source.postcard_bkg,
--> 189 source.postcard_path)
190 else:
191 self.post_obj = Postcard_tesscut(source.cutout)

~/eleanor/eleanor/postcard.py in init(self, filename, background, filepath)
56 self.filename = os.path.join(filepath, filename)
57 self.local_path = copy.copy(self.filename)
---> 58 self.hdu = fits.open(self.local_path)
59 self.background2d = fits.open(os.path.join(filepath, background))[1].data
60

~/anaconda3/envs/tess/lib/python3.7/site-packages/astropy/io/fits/hdu/hdulist.py in fitsopen(name, mode, memmap, save_backup, cache, lazy_load_hdus, ignore_missing_simple, **kwargs)
172
173 return HDUList.fromfile(name, mode, memmap, save_backup, cache,
--> 174 lazy_load_hdus, ignore_missing_simple, **kwargs)
175
176

~/anaconda3/envs/tess/lib/python3.7/site-packages/astropy/io/fits/hdu/hdulist.py in fromfile(cls, fileobj, mode, memmap, save_backup, cache, lazy_load_hdus, ignore_missing_simple, **kwargs)
409 save_backup=save_backup, cache=cache,
410 ignore_missing_simple=ignore_missing_simple,
--> 411 lazy_load_hdus=lazy_load_hdus, **kwargs)
412
413 @classmethod

~/anaconda3/envs/tess/lib/python3.7/site-packages/astropy/io/fits/hdu/hdulist.py in _readfrom(cls, fileobj, data, mode, memmap, cache, lazy_load_hdus, ignore_missing_simple, **kwargs)
1088 if hdulist._file.close_on_error:
1089 hdulist._file.close()
-> 1090 raise OSError('No SIMPLE card found, this file does not '
1091 'appear to be a valid FITS file')
1092

OSError: No SIMPLE card found, this file does not appear to be a valid FITS file

Please help me