Vision With GRIP

[kingnyancatjack]

We have this code, but can't figure out why it doesn't work.
import wpilib
import networktables
from networktables import NetworkTable
class Vision():
def __init__(self):
# NetworkTable.setIPAddress("10.26.5.73")
# NetworkTable.setServerMode()
self.table = NetworkTable.getTable('GRIP/myContoursReport')

def printCenter(self):
self.centerX = networktables.NumberArray()
self.center = self.table.retrieveValue("centerX", self.centerX)
print("Center: " + str(self.center))

Please help.