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Gamma GLM issue with Fitted Residuals Plot

Good evening, everyone! I teach statistics for a doctoral health science program, and I'm updating our didactic content for Gamma GLMs. However, no matter how many times I simulate a dataset to run a Gamma GLM and populate Residuals vs. Fitted plots, I get this error:

I would really hate to have to pull the residual diagnostics from flexplot in R for the students to use, so I'm hoping someone knows how to get around this error! For the record, my data has no zeroes, no negative numbers, no string data, or missing data. I've also attached the simulated test dataset here so you can reproduce it yourself:


Thanks for the help!

-Dan

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