fix sample code so it runs

[djpnewton]

No description provided.

[codecov]

Codecov Report

Merging #527 (56477e5) into master (8aa4e43) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #527   +/-   ##
=======================================
  Coverage   97.98%   97.98%           
=======================================
  Files          26       26           
  Lines        3331     3331           
=======================================
  Hits         3264     3264           
  Misses         67       67           

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[jwag956]

Thanks!