import lightgbm returned non-zero exit status 2

I am running Windows 10. Today I installed lightgbm through anaconda using

conda install -c conda-forge lightgbm

However, when I tried to import lightgbm (running Jupyter Notebook), I got the following error trace:

---------------------------------------------------------------------------
CalledProcessError                        Traceback (most recent call last)
<ipython-input-2-5dacb4a27011> in <module>
----> 1 import lightgbm as lgb

D:\RI\0Teaching Materials\QTDM-II\P30 LGBM\lightgbm.py in <module>
     10 
     11 from subprocess import check_output
---> 12 print(check_output(["ls", "../input"]).decode("utf8"))
     13 
     14 # Any results you write to the current directory are saved as output.

~\Anaconda3\lib\subprocess.py in check_output(timeout, *popenargs, **kwargs)
    334 
    335     return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
--> 336                **kwargs).stdout
    337 
    338 

~\Anaconda3\lib\subprocess.py in run(input, timeout, check, *popenargs, **kwargs)
    416         if check and retcode:
    417             raise CalledProcessError(retcode, process.args,
--> 418                                      output=stdout, stderr=stderr)
    419     return CompletedProcess(process.args, retcode, stdout, stderr)
    420 

CalledProcessError:Command '['ls', '../input']' returned non-zero exit status 2.

What is preventing me from importing lightgbm?

Update:- Thinking that this is a Windows issue, I installed Anaconda on Ubuntu (Oracle VB) and tried import. Unfortunately, same error occurred in this environment too. What could be behind this?

from import lightgbm returned non-zero exit status 2