Save dict as netCDF / xarray

Question

I have a problem. I want to save a dict. But unfortunately I got the following error - TypeError: expected bytes, list found. I want to save my my_dict as netCDF. How could I save my dict? I looked at https://docs.xarray.dev/en/stable/user-guide/io.html , Saving Python dictionary to netCDF4 file and some other links and blogs

from netCDF4 import Dataset

my_dict = {
'_key': '1',
 'group': 'test',
 'data': {},
 'type': '',
 'code': '007',
 'conType': '1',
 'flag': None,
 'createdAt': '2021',
 'currency': 'EUR',
 'detail': {
        'selector': {
            'number': '12312',
            'isTrue': True,
            'requirements': [{
                'type': 'customer',
                'requirement': '1'}]
            }
        }   

 'identCode': [],
 }
ds = Dataset(my_dict)
[OUT] TypeError: expected bytes, list found
ds.to_netcdf("saved_on_disk.nc")