Update the conversion error message in np module

[SasinduDilshara]

$Subject

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.89%. Comparing base (3d713ba) to head (7fb69c0).
Report is 2 commits behind head on main.

❌ Your project status has failed because the head coverage (69.89%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   69.89%   69.89%           
=======================================
  Files           6        6           
  Lines         186      186           
  Branches       53       53           
=======================================
  Hits          130      130           
  Misses         56       56           

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