Failure to open saved scene

Hi James:
Thanks for pointing out. Recent log file is down below.

Errors:

Error parsing XML in stream at line 39, column 57, byte index 11184: not well-formed (invalid token)
The following modules failed to be instantiated:
   ChangeTracker
loadSourceAsModule - Failed to load file "C:/Users/Yakup/AppData/Local/NA-MIC/Slicer 4.11.20210226/NA-MIC/Extensions-29738/ChangeTracker/lib/Slicer-4.11/qt-scripted-modules/ChangeTracker.py"  as module "ChangeTracker" !
Fail to instantiate module  "ChangeTracker"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Users\Yakup\AppData\Local\NA-MIC\Slicer 4.11.20210226\lib\Python\Lib\imp.py", line 170, in load_source
    module = _exec(spec, sys.modules[name])
  File "<frozen importlib._bootstrap>", line 618, in _exec
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "C:/Users/Yakup/AppData/Local/NA-MIC/Slicer 4.11.20210226/NA-MIC/Extensions-29738/ChangeTracker/lib/Slicer-4.11/qt-scripted-modules/ChangeTracker.py", line 4, in <module>
    import ChangeTrackerWizard
  File "C:\Users\Yakup\AppData\Local\NA-MIC\Slicer 4.11.20210226\NA-MIC\Extensions-29738\ChangeTracker\lib\Slicer-4.11\qt-scripted-modules\ChangeTrackerWizard\__init__.py", line 2, in <module>
    from ChangeTrackerStep import *
ModuleNotFoundError: No module named 'ChangeTrackerStep'

Warnings:
When loading module  "ChangeTrackerSelfTest" , the dependency "ChangeTracker" failed to be loaded.
libpng warning: iCCP: known incorrect sRGB profile