Google Earth Engine（GEE）——sentinel-1数据处理过程中出现错误Dictionary does not contain key: bucketMeans

var imageVisParam = {"opacity":1,"bands":["VV"],"min":-25,"max":25,"gamma":1},
    imageVisParam3 = {"opacity":1,"bands":["water"],"palette":["1d0701","3812ff"]};
// 计算面积是geometre,roi是buffer后的
var geometry=ee.FeatureCollection("users/smowry1/hbsk").filter(ee.Filter.eq("id",1));
var buffer=geometry.first().get("buffer");
var roi=geometry.geometry().buffer(buffer)
var roiarea=ee.Number(roi.area()).divide(1000000)
// var bufferarea=roi.area.divide(1000000)
print(roi.area(),"buffer面")
print(buffer);
Map.centerObject(geometry, 8)
function clip(img){
  return img.clip(roi)
}
// 坡度校正
function slopeCorrection(image) { 
  var imgGeom =roi
  var srtm = ee.Image('JAXA/ALOS/AW3D30/V2_2').select('AVE_DSM').clip(imgGeom) 
  var sigma0Pow = ee.Image.constant(10).pow(image.divide(10.0))
 
  // Article ( numbers relate to chapters) 
  // 2.1.1 Radar geometry 
  var theta_i = image.select('angle')
  var phi_i = ee.Terrain.aspect(theta_i)
    .reduceRegion(ee.Reducer.mean(), theta_i.get('system:footprint'), 1000)
    .get('aspect')
 
  // 2.1.2 Terrain geometry
  var alpha_s = ee.Terrain.slope(srtm).select('slope')
  var phi_s = ee.Terrain.aspect(srtm).select('aspect')
 
  // 2.1.3 Model geometry
  // reduce to 3 angle
  var phi_r = ee.Image.constant(phi_i).subtract(phi_s)
 
  // convert all to radians
  var phi_rRad = phi_r.multiply(Math.PI / 180);
  var alpha_sRad = alpha_s.multiply(Math.PI / 180);
  var theta_iRad = theta_i.multiply(Math.PI / 180);
  var ninetyRad = ee.Image.constant(90).multiply(Math.PI / 180);
 
  // slope steepness in range (eq. 2)
  var alpha_r = (alpha_sRad.tan().multiply(phi_rRad.cos())).atan();
 
  // slope steepness in azimuth (eq 3)
  var alpha_az = (alpha_sRad.tan().multiply(phi_rRad.sin())).atan();
 
  // local incidence angle (eq. 4)
  var theta_lia = (alpha_az.cos().multiply((theta_iRad.subtract(alpha_r)).cos())).acos();
  var theta_liaDeg = theta_lia.multiply(180 / Math.PI);
  // 2.2 
  // Gamma_nought_flat
  var gamma0 = sigma0Pow.divide(theta_iRad.cos())
  var gamma0dB = ee.Image.constant(10).multiply(gamma0.log10());
  var ratio_1 = gamma0dB.select('VV').subtract(gamma0dB.select('VH'));
 
  // Volumetric Model
  var nominator = (ninetyRad.subtract(theta_iRad).add(alpha_r)).tan();
  var denominator = (ninetyRad.subtract(theta_iRad)).tan();
  var volModel = (nominator.divide(denominator)).abs();
 
  // apply model
  var gamma0_Volume = gamma0.divide(volModel);
  var gamma0_VolumeDB = ee.Image.constant(10).multiply(gamma0_Volume.log10());