Improve error messages

[dutradda]

Add some suggestions about the origin of error

[codecov-commenter]

Codecov Report

Merging #639 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #639   +/-   ##
=======================================
  Coverage   50.25%   50.25%           
=======================================
  Files          86       86           
  Lines        6230     6230           
=======================================
  Hits         3131     3131           
  Misses       2887     2887           
  Partials      212      212           

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