Theilsen function use to determine the change of certain variable over the specified time horizon

TheilSen(df, pollutant = "Black_Carbon",

  •      ylab = "ozone (ppb)", 
  •      deseason = TRUE,
  •      Date.format = "%Y")

Error in order(dates) : argument 1 is not a vector

Please help to debug this

Does df contain a field called date with the correct format? Can you provide a reproducible example with a minimal dataset the reproduces that problem?

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