[Python] Max stress from ODB

I'm new in programming and I need to write a code that create an odb that visualize max value of six field output of a single step. For every single node I would like represent the max value of each field output. Now I've created a code which results in this this error:

myFieldOutput.addData(position=INTEGRATION_POINT, instance=instance1, data=maxStress)

omu_PrimArray from sequence failed - dimensions.
​

This is the code:

from abaqus import *
from abaqusConstants import *
import visualization
myViewport = session.Viewport(name='Max_Stess',
origin=(10, 10), width=150, height=100)
# Open the tutorial output database.
myOdb = visualization.openOdb(path='PROVA_04_10.odb', readOnly=False)
# Associate the output database with the viewport.
myViewport.setValues(displayedObject=myOdb)
instance1 = myOdb.rootAssembly.instances['MODIFICA_FUNZIONANTE']
# Create variables that refer to the first steps.
firstStep = myOdb.steps['sigma_equivalenti']

frame = firstStep.frames[-1]
#creo nuovo step

# lettura degli stress dallo step sigma

sigma_eq_1 = frame.fieldOutputs['sigma_eq_1']
sigma_eq_2 = frame.fieldOutputs['sigma_eq_2']
sigma_eq_3 = frame.fieldOutputs['sigma_eq_3']
sigma_eq_4 = frame.fieldOutputs['sigma_eq_4']
sigma_eq_5 = frame.fieldOutputs['sigma_eq_5']
sigma_eq_6 = frame.fieldOutputs['sigma_eq_6']

#calcolo del vettore degli sforzi massimi

maxStress=[]
for i in range(len(sigma_eq_1.values)):
v1=sigma_eq_1.values
v2=sigma_eq_2.values
v3=sigma_eq_3.values
v4=sigma_eq_4.values
v5=sigma_eq_5.values
v6=sigma_eq_6.values
maxStress.append((max(v1,v2,v3,v4,v5,v6),)) #max(valori)


myFieldOutput = frame.FieldOutput(name='tensioni_max',description='calcolo delle tensioni massime', type=SCALAR)
myFieldOutput.addData(position=INTEGRATION_POINT, instance=instance1, data=maxStress)

#visualizzazione della variabile delle sigma massima sul programma
myViewport.odbDisplay.setPrimaryVariable(field=myFieldOutput,outputPosition=INTEGRATION_POINT)
myViewport.odbDisplay.display.setValues(plotState=(CONTOURS_ON_DEF,))

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