Converting object to an encodable object failed: Instance of 'NoSuchMethodError'

[HEBOS]

Describe the bug
Getting Converting object to an encodable object failed: Instance of 'NoSuchMethodError', when I try performing API request.
I can see similar issue closed long time ago: #335 , but it is still happening to me.

To Reproduce
swagger.json

final blobFile = BlobFile(
          documentType: DocumentType.cashdocument,
          date: DateTime.now(),
          description: null,
          name: 'test',
          blobFormatType: BlobFormatType.pdf,
          blobFileType: BlobFileType.document,
          blobFileId: 'test',
          lastChange: (
            userId: 'test',
            date: DateTime.now(),
          ),
          owner: UserOwned(
            userId: 'test',
            name: 'test',
          ).toJson(),
          team: TeamOwned(
            teamId: 'test',
            name: 'test',
          ),
        );

final uploadResult = await _treemlyClientService.client.apiBlobFilesPost(
          body: blobFile,
        );

Settings used for generating client:

targets:
  $default:
    sources:
      - lib/**
      - swagger/**
      - $package$
    builders:
      chopper_generator:
        options:
          header: "//Generated code"
      swagger_dart_code_generator|swagger_dart_code_generator:
        options:
          input_folder: 'swagger/'
          output_folder: 'lib/api'
          with_converter: true
          ignore_headers: true
          additional_headers:
            - "Cache-Control"
          separate_models: true
          usePathForRequestNames: false
          enums_case_sensitive: true
          use_required_attribute_for_headers: true
          include_if_null: false
          default_values_map:
            - type_name: int
              default_value: '0'
            - type_name: String
              default_value: 'default'
            - type_name: 'List<String>'
              default_value: '[]'

Expected behavior
Expected is for API request to be executed.

Swagger specification link
Attached, so no link needed.

Library version used:
2.15.2

Additional context
n/a