MeshLab did not finish successfully. Review the log file and the input file(s) to see what went wrong.

[HelloMaroon]

I'm testing the simplifying function on Colab with installation code:
pip install meshlabxm

The whole code is like this:

import os
import sys
import inspect
import meshlabxml as mlx
import platform
import glob
import shutil
import time

'''
Description: It takes around 17 minutes with this script to decimate in bulk a 3M faces Model into 7 resolutions
			 [100K, 200K, 300K, 400K, 500K, 600K, 750K]. For improving this time, consider using simplifybulkthreaded.py
			 for a threaded implementation.
Usage: python3 simplifybulknothreading.py
You can of course include functionality to take arguments from command line/terminal like I did in simplify.py
DO NOT FORGET to change: Decimations_List, originalMesh (name of original mesh), SimplifiedMesh & Textures
Enjoy!
'''
MESHLABSERVER_PATH = 'C:\Program Files\VCG\MeshLab'
os.environ['PATH'] += os.pathsep + MESHLABSERVER_PATH


def simplify(originalMeshName, SimplifiedMeshName, NumberOfFaces, WithTexture):
	# File names
	FilterScript = 'SimplificationFilter.mlx'  # script file
	original_mesh = originalMeshName # input file
	simplified_mesh = SimplifiedMeshName  # output file
	Num_Of_Faces = int(NumberOfFaces)  # Final Number of Faces

	# Check the input mesh number of faces (so that we do not decimate to a higher number of faces than original mesh)
	MetricsMeshDictionary = {}
	MetricsMeshDictionary = mlx.files.measure_topology(original_mesh)
	# print (MetricsMeshDictionary)
	print('\n Number of faces of original mesh is: ' + str(MetricsMeshDictionary['face_num'] )) 

	if(MetricsMeshDictionary['face_num'] <= Num_Of_Faces):
	    #exit the script and print a message about it
	    print("\n SORRY your decimated mesh can not have higher number of faces that the input mesh.....")
	    print("\n ......................................................................................")
	    sys.exit()

	# Creating a folder named as the Number of faces: named '150000'
	print('\n Creating a folder to store the decimated model ...........')
	if not os.path.exists(str(Num_Of_Faces)):
	    os.makedirs(str(Num_Of_Faces))


	simplified_meshScript = mlx.FilterScript(file_in=original_mesh, file_out=str(Num_Of_Faces) + '/' + simplified_mesh,
	                                         ml_version='2016.12')  # Create FilterScript object

	mlx.remesh.simplify(simplified_meshScript, texture=WithTexture, faces=Num_Of_Faces,
	                    target_perc=0.0, quality_thr=1.0, preserve_boundary=True,
	                    boundary_weight=1.0, preserve_normal=True,
	                    optimal_placement=True, planar_quadric=True,
	                    selected=False, extra_tex_coord_weight=1.0)
	print('\n Beginning the process of Decimation ...........')

	simplified_meshScript.run_script()  # Run the script
	os.chdir(str(Num_Of_Faces))
	print('\n Process of Decimation Finished ...')
	print('\n Copying textures (PNG and JPEG) into the folder of decimated model....')

	#go back to parent directory so we can copy the textures to the 3D Model folder
	os.chdir('..')

	#Now checking for textures in the folder of the input mesh.... (plz change if needed)
	allfilelist= os.listdir('.')

	for Afile in allfilelist[:]: 
	    if not(Afile.endswith(".png") or Afile.endswith(".PNG") or Afile.endswith(".jpg") or Afile.endswith(".JPG")):
	        allfilelist.remove(Afile)
	print('\n Found the LIST of images in PNG and JPEG (textures): ')
	print(allfilelist)

	for file in allfilelist:
	    shutil.copy(file, str(Num_Of_Faces))

	print('\n sleeping for 3 seconds.... ')
	time.sleep(3)


Decimations_List = [100]
originalMesh = '/content/drive/MyDrive/DGCNN/airplane_0627.obj'
SimplifiedMesh = '/content/drive/MyDrive/DGCNN/airplane_simpliyed_0627.obj'
Textures = True

print("...........Starting timer for the decimation process............")
initial_time = time.time()

for decimation_resolution in Decimations_List:
	simplify(originalMesh, SimplifiedMesh, decimation_resolution, Textures)


finish_time = time.time()
print("---Decimation Process took: %s seconds ---" % (finish_time - initial_time))
print("\n Done.... have a good day!")

Then when I run this code, I have this bug:

...........Starting timer for the decimation process............
meshlabserver cmd = meshlabserver -l TEMP3D_measure_topology_log.txt -i "/content/drive/MyDrive/DGCNN/airplane_0627.obj" -s "TEMP3D_measure_topology.mlx"
***START OF MESHLAB STDOUT & STDERR***

Houston, we have a problem. 
MeshLab did not finish successfully. Review the log file and the input file(s) to see what went wrong.
MeshLab command: "meshlabserver -l TEMP3D_measure_topology_log.txt -i "/content/drive/MyDrive/DGCNN/airplane_0627.obj" -s "TEMP3D_measure_topology.mlx""
Where do we go from here?
 r  - retry running MeshLab (probably after you've fixed any problems with the input files)
 c  - continue on with the script (probably after you've manually re-run and generated the desired output file(s)
 x  - exit, keeping the TEMP3D files and log
 xd - exit, deleting the TEMP3D files and log
Select r, c, x (default), or xd:

And the code shows that the bug happened in this line:

MetricsMeshDictionary = mlx.files.measure_topology(original_mesh)

Could you please tell me how to solve it? Thanks!

[3DLIRIOUS]

The PyPi package is rather out of date, and unfortunately the update process has changed significantly since I last updated. Until I can release a new version, I'd recommend you try the git version instead and let me know if you still have the same error. You should be able to install using:

pip install -e git+git://github.com/3DLIRIOUS/MeshLabXML#egg=MeshLabXML

[HelloMaroon]

I used this sentence:
pip install -e git+git://github.com/3DLIRIOUS/MeshLabXML#egg=MeshLabXML
and this is the result:

Obtaining MeshLabXML from git+git://github.com/3DLIRIOUS/MeshLabXML#egg=MeshLabXML
  Cloning git://github.com/3DLIRIOUS/MeshLabXML to ./src/meshlabxml
  Running command git clone -q git://github.com/3DLIRIOUS/MeshLabXML /content/src/meshlabxml
Installing collected packages: MeshLabXML
  Running setup.py develop for MeshLabXML
Successfully installed MeshLabXML-2021.7

Then the bug happened in here:
import meshlabxml as mlx
ModuleNotFoundError: No module named 'meshlabxml'

I thought maybe I should change the name of the module, so I tried this:
import MeshLabXML as mlx
However, result:
ModuleNotFoundError: No module named 'MeshLabXML'

[3DLIRIOUS]

I'm not sure, however there are several hits for this issue, for example here and here.

You could try removing the -e flag, or installing from a local copy instead of the github repo.

[nref]

Removing -e fixed the above error for me. Also, git+git:// doesn't work anymore:

Obtaining MeshLabXML from git+git://github.com/3DLIRIOUS/MeshLabXML#egg=MeshLabXML
  Cloning git://github.com/3DLIRIOUS/MeshLabXML to c:\git\raystation\raycommand.services\motion\scripts\src\meshlabxml
  Running command git clone --filter=blob:none --quiet git://github.com/3DLIRIOUS/MeshLabXML 'C:\git\RayStation\RayCommand.Services\Motion\Scripts\src\meshlabxml'
  fatal: remote error:
    The unauthenticated git protocol on port 9418 is no longer supported.
  Please see https://github.blog/2021-09-01-improving-git-protocol-security-github/ for more information.

Fixed it by using git+https:// instead.

pip install git+https://github.com/3DLIRIOUS/MeshLabXML#egg=MeshLabXML