inconsistent use of tabs and spaces in indentation

[cv55]

Hello, thanks for writing NGSCheckMate!

There seems to be an issue when using Python 3.9.7 to run the tool.
The error I get is:

File "/Users/u0149445/Desktop/variant_calling/NGSCheckMate/ncm_test.py", line 66
link = root + '/' + file
TabError: inconsistent use of tabs and spaces in indentation
When using Python 2.7 the tools works.

Maybe it is worth having a look.

Thank you!