Fix reading example of FrankenStruct

[simsurace]

Closes #410

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.18%. Comparing base (56c6a04) to head (1caf19c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #416   +/-   ##
=======================================
  Coverage   90.18%   90.18%           
=======================================
  Files           7        7           
  Lines        1345     1345           
=======================================
  Hits         1213     1213           
  Misses        132      132           

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[hyrodium]

Thank you for the PR! I have checked the updated example does not throw an error.

[quinnj]

Thanks!