CUSTOM IMPORT ERROR ：Specfem2D Workstation Examples on unbuntu 25

[hongqiangli]

Hi， i am installing and testing the code， when test Specfem2D Workstation Examples， there are some problems，could help me？
seisflows examples setup 1 -r /home/suma/sepcfem2d

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================================================================================
SEISFLOWS EXAMPLE 1
///////////////////
This is a [SPECFEM2D] [WORKSTATION] example, which will run an inversion to
assess misfit between two homogeneous halfspace models with slightly different
velocities. [1 events, 1 station, 1 iterations]. The tasks involved include:

1. (optional) Download, configure, compile SPECFEM2D
2. [Setup] a SPECFEM2D working directory
3. [Setup] starting model from 'Tape2007' example
4. [Setup] target model w/ perturbed starting model
5. [Setup] a SeisFlows working directory
6. [Run] the inversion workflow
   ================================================================================

================================================================================
EXAMPLE SETUP

SPECFEM2D already configured, skipping 'configure'
executables found in SPECFEM2D/bin directory, skipping 'make'

================================================================================
GENERATING INITIAL MODEL

Setting the SPECFEM2D Par_file for SeisFlows compatiblility
NPROC: 1 -> 1
setup_with_binary_database: 0 -> 1
SAVE_MODEL: default -> binary
save_ASCII_kernels: .true. -> .false.
Running SPECFEM2D with command: ./bin/xmeshfem2D > OUTPUT_FILES/mesher.log.txt
Running SPECFEM2D with command: ./bin/xspecfem2D > OUTPUT_FILES/solver.log.txt
Cleaning up after xspecfem2d, setting up for new run

================================================================================
GENERATING TRUE/TARGET MODEL

Updating initial homogeneous velocity model values
VELOCITY_MODEL:

1 1 2600.d0 5800.d0 3500.0d0 0 0 10.d0 10.d0 0 0 0 0 0 0
->
1 1 2600.d0 5900.d0 3550.0d0 0 0 10.d0 10.d0 0 0 0 0 0 0
Running SPECFEM2D with command: ./bin/xmeshfem2D > OUTPUT_FILES/mesher.log.txt
Running SPECFEM2D with command: ./bin/xspecfem2D > OUTPUT_FILES/solver.log.txt

Cleaning up after xspecfem2d, setting up for new run
created parameter file: parameters.yaml
workflow: forward -> inversion
configuring SeisFlows parameter file

================================================================================
CUSTOM IMPORT ERROR
///////////////////
Module could not be imported seisflows.workflow.inversion

cannot import name 'PdfMerger' from 'pypdf' (/home/suma/anaconda3/envs/seisflows/lib/python3.12/site-packages/pypdf/init.py)

Traceback (most recent call last):
File "/home/suma/seisflows/seisflows/tools/config.py", line 351, in custom_import
module = import_module(full_dotted_name)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/suma/anaconda3/envs/seisflows/lib/python3.12/importlib/init.py", line 90, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "", line 1387, in _gcd_import
File "", line 1360, in _find_and_load
File "", line 1331, in _find_and_load_unlocked
File "", line 935, in _load_unlocked
File "", line 999, in exec_module
File "", line 488, in _call_with_frames_removed
File "/home/suma/seisflows/seisflows/workflow/inversion.py", line 27, in
from seisflows.workflow.migration import Migration
File "/home/suma/seisflows/seisflows/workflow/migration.py", line 27, in
from seisflows.tools.model import Model
File "/home/suma/seisflows/seisflows/tools/model.py", line 16, in
from seisflows.tools.graphics import plot_2d_image
File "/home/suma/seisflows/seisflows/tools/graphics.py", line 14, in
from pypdf import PdfMerger
ImportError: cannot import name 'PdfMerger' from 'pypdf' (/home/suma/anaconda3/envs/seisflows/lib/python3.12/site-packages/pypdf/init.py). Did you mean: 'PdfReader'?
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