[R] Error in split.default

[Jason Rupert]

> split(df, Status)
Error in split.default(x = seq_len(nrow(x)), f = f, drop = drop, ...) : 
  object 'Status' not found


> names(PCR_duplicatedCheck_df)
 [1] "Key"  "MinCreated"  "MaxUpdated"          
 [4] "Status"

I am totally confused...what do I need to try next?