CLI error message

[sepandhaghighi]

Reference Issues/PRs

#12

What does this implement/fix? Explain your changes.

• CLI error message modified
• Codecov upload bug fixed
• codecov.yml bug fixed
• Test system modified

Any other comments?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.37%. Comparing base (dc0132f) to head (2c0a790).
Report is 5 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #48      +/-   ##
==========================================
- Coverage   95.81%   95.37%   -0.43%     
==========================================
  Files           4        4              
  Lines         143      151       +8     
  Branches       18       19       +1     
==========================================
+ Hits          137      144       +7     
  Misses          2        2              
- Partials        4        5       +1     

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