I am getting this error whenever i am running python teaser_python_3dsmooth.py. pls help

[GKarthikn92]

~/TEASER-plusplus/examples/teaser_python_3dsmooth$ python teaser_python_3dsmooth.py
Traceback (most recent call last):
File "teaser_python_3dsmooth.py", line 7, in
from sklearn.neighbors import KDTree
File "/home/karthik/anaconda3/envs/teaser_test/lib/python3.6/site-packages/sklearn/init.py", line 82, in
from .base import clone
File "/home/karthik/anaconda3/envs/teaser_test/lib/python3.6/site-packages/sklearn/base.py", line 17, in
from .utils import _IS_32BIT
File "/home/karthik/anaconda3/envs/teaser_test/lib/python3.6/site-packages/sklearn/utils/init.py", line 23, in
from .class_weight import compute_class_weight, compute_sample_weight
File "/home/karthik/anaconda3/envs/teaser_test/lib/python3.6/site-packages/sklearn/utils/class_weight.py", line 7, in
from .validation import _deprecate_positional_args
File "/home/karthik/anaconda3/envs/teaser_test/lib/python3.6/site-packages/sklearn/utils/validation.py", line 26, in
from .fixes import _object_dtype_isnan, parse_version
File "/home/karthik/anaconda3/envs/teaser_test/lib/python3.6/site-packages/sklearn/utils/fixes.py", line 20, in
import scipy.stats
File "/home/karthik/anaconda3/envs/teaser_test/lib/python3.6/site-packages/scipy/stats/init.py", line 348, in
from .stats import *
File "/home/karthik/anaconda3/envs/teaser_test/lib/python3.6/site-packages/scipy/stats/stats.py", line 175, in
import scipy.special as special
File "/home/karthik/anaconda3/envs/teaser_test/lib/python3.6/site-packages/scipy/special/init.py", line 640, in
from ._ufuncs import *
ImportError: libgfortran.so.4: cannot open shared object file: No such file or directory

[LimHyungTae]

There's little information, but could you please run sudo ldconfig? This error does not occur from our codes