help with an anova error

General
1

Trying to run an anova test, but here is what the error showing! thank you!

Error in levels(x) : only 0's may be mixed with negative subscripts

  1. as.vector(levels(x), mode)

  2. as.vector.factor(x, mode)

  3. as.vector(x, mode)

  4. as.vector(data)

  5. array(x, c(length(x), 1L), if (!is.null(names(x))) list(names(x), NULL) else NULL)

  6. as.matrix.default(effects)

  7. as.matrix(effects)

  8. summary.aov(anova)

  9. summary(anova)

2

Could you post a reproducible example, called a reprex, please?

3

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