Fix error message

[luciansmith]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (f555e25) 92.41% compared to head (ad77184) 92.41%.
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev      #17   +/-   ##
=======================================
  Coverage   92.41%   92.41%           
=======================================
  Files           6        6           
  Lines         435      435           
=======================================
  Hits          402      402           
  Misses         33       33           

Flag	Coverage Δ
unittests	92.41% <100.00%> (ø)

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Files Changed	Coverage Δ
biosimulators_tellurium/core.py	91.29% <ø> (ø)
biosimulators_tellurium/_version.py	100.00% <100.00%> (ø)

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