Error occurred while computing the mean of the index image

[Huanglh1001]

Calculating the maximum and minimum values of water indices either yields no results or produces calculation errors. However, performing calculations on specific image bands yields results. Why is this the case? (Below are the results and the code.)

# initial
import ee
import geemap
geemap.ee_initialize()
ee.Initialize()

# ROI
Map = geemap.Map(center=[36 , 120], zoom=8)
region = ee.Geometry.BBox(119.76, 36, 120.5, 36.7)
fc = ee.FeatureCollection(region)
style = {'color': 'ffff00ff', 'fillColor': '00000000'}
Map.addLayer(fc.style(**style), {}, 'ROI')
Map

# get image
collection = ee.ImageCollection("COPERNICUS/S2_SR_HARMONIZED") \
    .filterDate('2019-01-01', '2020-01-01') \
    .filterBounds(fc)\
    .filter(ee.Filter.lt('CLOUDY_PIXEL_PERCENTAGE',5))
image = collection.median().clipToCollection(fc) 
vis = {
  'min': 0.0,
  'max': 3000,
  'bands': ['B4', 'B3', 'B2'],
}
Map.add_layer(image,vis,'s2')
Map.centerObject(fc)
Map

# MNDWI
MNDWI = image.normalizedDifference(['B3', 'B11']).rename('MNDWI')
visParams = {
  min: -1,
  max: 1,
  'palette': ['blue', 'white', 'green']
};
Map.addLayer(MNDWI, visParams, 'MNDWI');
Map

# cal min max mean
Blue = image.select(['B2'])
mean = geemap.image_mean_value(Blue,fc)
mean.getInfo()

# MNDWI mean
mean = geemap.image_mean_value(MNDWI,fc)
mean.getInfo()

# MNDWI max
maxValue = geemap.image_max_value(MNDWI,fc)
maxValue.getInfo()

[giswqs]

You can specify the scale parameter.

[Huanglh1001]

Thank you for your reply！！！This means I need to set a larger resolution when setting the scale, just like in GEE, where the number of pixels used in a single statistical calculation is limited (e.g., 10,000,000)？