[Bug]: Validator issue for nwbfile using ndx-multisubjects and ndx-sound

[nehatk17]

What happened?

I've crated a group NWB file using ndx-sound and ndx-multisubjects; however, running the validator (dandi validate, nwbinspector, and pynwb-validate) results in an error:
ValueError: data type 'NdxMultiSubjectsNWBFile' not found in namespace ndx-sound

Steps to Reproduce

nwbinspector "filepath.nwb"

Traceback

**************************************************
NWBInspector Report Summary

Timestamp: 2026-07-06 14:22:32.533608-04:00
Platform: macOS-15.7.7-arm64-arm-64bit-Mach-O
NWBInspector version: 0.6.3

Found 1 issues over 1 files:
       1 - ERROR
**************************************************


0  ERROR
========

0.0  /Users/thoman1/Documents/Projects/EMBER/Code/Sanes/NWB_Sanes_1/sub-multisubject/sanes_multisubject_1.nwb: During io.read() - <class 'ValueError'>: data type 'NdxMultiSubjectsNWBFile' not found in namespace ndx-sound - 'None' object with name 'None'
       Message: Traceback (most recent call last):
  File "/Users/thoman1/anaconda3/envs/nwb_neurconv_sleap/lib/python3.13/site-packages/hdmf/validate/validator.py", line 290, in get_validator
    return self.__validators[dt]
           ~~~~~~~~~~~~~~~~~^^^^
KeyError: 'NdxMultiSubjectsNWBFile'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/thoman1/anaconda3/envs/nwb_neurconv_sleap/lib/python3.13/site-packages/nwbinspector/_nwb_inspection.py", line 281, in inspect_nwbfile
    validation_result = pynwb.validate(paths=[nwbfile_path])
  File "/Users/thoman1/anaconda3/envs/nwb_neurconv_sleap/lib/python3.13/site-packages/hdmf/utils.py", line 596, in func_call
    return func(**pargs)
  File "/Users/thoman1/anaconda3/envs/nwb_neurconv_sleap/lib/python3.13/site-packages/pynwb/validation.py", line 163, in validate
    validation_errors +=  _validate_single_file(path=p, **kwargs)
                          ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/Users/thoman1/anaconda3/envs/nwb_neurconv_sleap/lib/python3.13/site-packages/pynwb/validation.py", line 227, in _validate_single_file
    validation_errors += _validate_helper(io=io, namespace=validation_namespace)
                         ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/thoman1/anaconda3/envs/nwb_neurconv_sleap/lib/python3.13/site-packages/pynwb/validation.py", line 24, in _validate_helper
    return validator.validate(builder)
           ~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/Users/thoman1/anaconda3/envs/nwb_neurconv_sleap/lib/python3.13/site-packages/hdmf/utils.py", line 592, in func_call
    return func(args[0], **pargs)
  File "/Users/thoman1/anaconda3/envs/nwb_neurconv_sleap/lib/python3.13/site-packages/hdmf/validate/validator.py", line 308, in validate
    validator = self.get_validator(dt)
  File "/Users/thoman1/anaconda3/envs/nwb_neurconv_sleap/lib/python3.13/site-packages/hdmf/utils.py", line 592, in func_call
    return func(args[0], **pargs)
  File "/Users/thoman1/anaconda3/envs/nwb_neurconv_sleap/lib/python3.13/site-packages/hdmf/validate/validator.py", line 293, in get_validator
    raise ValueError(msg)
ValueError: data type 'NdxMultiSubjectsNWBFile' not found in namespace ndx-sound

Operating System

macOS

Python Executable

Conda

Python Version

3.13

Package Versions

environment_for_issue.txt

Code of Conduct

• I agree to follow this project's Code of Conduct
• Have you checked the Contributing document?
• Have you ensured this bug was not already reported?

[rly]

Thanks for filing this @nehatk17 . This error is unfortunately the same issue as #1777, which needs to be fixed in HDMF (hdmf-dev/hdmf#608). I'll prioritize this this week. I've started work on it over in HDMF and will keep you posted.