Hi @Santi,
I realised that you wanted to run perf eventually and that is when the problem occurs. The reason is that one of your classes has only one sample which creates a glitch in the code which must produce a more informative error on our end too. See below.
sort(table(Y_Diablo_input))
#> Y_Diablo_input
#> C_25_36 B_37_48 A_13_24 A_25_36 D_37_48 E_0_12 C_37_48 C_13_24 B_25_36 B_13_24
#> 1 4 7 9 9 9 10 11 12 13
#> D_13_24 E_13_24 A_0_12 E_37_48 D_0_12 C_0_12 E_25_36 HC_HC B_0_12
#> 13 14 16 17 18 19 20 28 29
However, I recommend you either merge that sample with the closest class or perform the analysis without it.
Best,
Al