How can we deal with error message that is "duplicate couples (id-time)..." ?

When I run the following code (fixed effect regression):

total_index_dem_model <- plm(SupDem ~ distance + gdpcap + pop + dem_duration + aut_neighbours
                          ,data = df_a,
                          index = c("country", "year"),
                          model = "within",

I get the following error:

  0 (non-NA) cases
In addition: Warning message:
In pdata.frame(data, index) :
  duplicate couples (id-time) in resulting pdata.frame
 to find out which, use, e.g., table(index(your_pdataframe), useNA = "ifany")

I could not solve the problem. WHen I run the suggested code in the warning message nothing changes. Many thanks in advance.

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