Don't get "no covariates" in fixed effects regression about specr HOT 1 CLOSED

library(dplyr)
library(fixest)
library(specr)

test_formula <- function(formula,data) {
  formula <-as.formula(paste0(formula, "|group1")) # fixed effects for group1
  feols(formula,data)
}
results <- run_specs(
  df = example_data,
  y = c("y1", "y2"),
  x = c("x1", "x2"),
  model = 'test_formula',
  controls = c("c1", "c2")
)

plot_specs(results)

specs <- setup(
  data = example_data,
  y = c("y1", "y2"),
  x = c("x1", "x2"),
  model = 'test_formula',
  controls = c("c1", "c2")
)


results <- specr(specs)

plot(results)