[Python] ETABS python (API)

I'm new to ETABS. My idea is to have a code that reads a file with a response spectrum and defines it in ETABS. I've tried with the setuser and setfile functions. Since I was having errors, I kept trying with an easier case. When running the code, the function returns -99 and not 0 (with setuser and setfile). If anyone knows what the error could be, it would be a great help. Note that uploading the file manually works.

import comtypes.client

# Conectar con ETABS
# Conectar con la instancia activa de ETABS
try:

etabs_object = comtypes.client.GetActiveObject("CSI.ETABS.API.ETABSObject")
print("Conexión establecida con ETABS.")
except Exception as e:
print(f"Error al conectar con ETABS: {e}")
exit()
# Acceder al modelo de SAP
try:

SapModel = etabs_object.SapModel
print("Modelo ETABS cargado exitosamente.")
except Exception as e:
print(f"Error al acceder al modelo de ETABS: {e}")
exit()

# Datos de prueba
periodos = [0.0, 0.1, 0.2, 0.5, 1.0, 2.0]
aceleraciones = [0.0, 0.5, 0.8, 1.2, 1.0, 0.6]
damp_ratio = 0.05

# Nombre del espectro
nombre_espectro = "EspectroPrueba"

ret=SapModel.Func.FuncRS.SetUser(nombre_espectro, len(periodos), periodos, aceleraciones,damp_ratio)
T, A, st = ret

if st != 0:
print(f"Error al crear el espectro. Código de retorno: {st}")

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