TypeError: 'Series' object is not callable

[akitxu]

I am learning classes in Python using injection. I am trying to develop this class using FFN. This is my exercise.

`class PreparadorFFN:

def __init__(self, log_retornos_diarios):
        self.cotiz_val = None
        self.perf = None
    
def preparar_datos_ffn(self):
    #self.data_val_ind =  importador.cotizaciones[[nom_val, nom_ind]]["2017":"2021"].pct_change()
    self.cotiz_val =  importador.cotizaciones[[nom_val]]["2017":"2021"].pct_change() 
    self.cotiz_val[nom_val] = self.cotiz_val.cumsum() + 100
    self.cotiz_val.iloc[0] = 100
    self.cotiz_val.dropna(inplace=True)
    np.seterr(all="ignore")
    self.perf = self.cotiz_val[nom_val].calc_stats()
    
    self.perf.display()               
    self.perf.display_monthly_returns()
    self.perf.stats()
    #print (f"\nCAGR {preparador_ffn.perf.stats['cagr']}")  
    

retornos_diarios = variaciones.retornos_diarios log_retornos_diarios = variaciones.log_retornos_diarios

preparador_ffn = PreparadorFFN(log_retornos_diarios) preparador_ffn.preparar_datos_ffn() #preparador_ffn.imprimir() #preparar_datos_ffn.perf.stats #preparador_ffn.perf.stats`

It returns the following error

`--------------------------------------------------------------------------- TypeError Traceback (most recent call last) in 23 24 preparador_ffn = PreparadorFFN(log_retornos_diarios) ---> 25 preparador_ffn.preparar_datos_ffn() 26 #preparador_ffn.imprimir() 27 #preparar_datos_ffn.perf.stats

in preparar_datos_ffn(self) 16 self.perf.display() 17 self.perf.display_monthly_returns() ---> 18 self.perf.stats() 19 #print (f"\nCAGR {preparador_ffn.perf.stats['cagr']}") 20

TypeError: 'Series' object is not callable`

How can I solve it? I will appreciate help.