fix error messages

[araujoms]

The code is doing the right thing, I'm changing the error messages to match.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.89%. Comparing base (97a712f) to head (bd5eb17).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1171      +/-   ##
==========================================
- Coverage   91.92%   91.89%   -0.04%     
==========================================
  Files          34       34              
  Lines       15353    15353              
==========================================
- Hits        14113    14108       -5     
- Misses       1240     1245       +5     

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[dkarrasch]

Thanks, @araujoms!