az aks get-credential fails with aks-preview extension 14.0.0b4

[leivavictor]

Describe the bug

Hello all,
I'm creating this issue since it seems that aks-preview extension 14.0.0b4 is causing "az aks get-credential" command to fail.

Related command

az aks get-credentials

Errors

The command failed with an unexpected error. Here is the traceback:
'NoneType' object has no attribute 'dict'
Traceback (most recent call last):
File "/opt/az/lib/python3.12/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/commands/init.py", line 564, in execute
self.commands_loader.load_arguments(command)
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/init.py", line 549, in load_arguments
loader.load_arguments(command) # this adds entries to the argument registries
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/.azure/cliextensions/aks-preview/azext_aks_preview/init.py", line 45, in load_arguments
load_arguments(self, command)
File "/home/user/.azure/cliextensions/aks-preview/azext_aks_preview/_params.py", line 429, in load_arguments
k8s_support_plans = self.get_models(
^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/init.py", line 804, in get_models
return get_sdk(self.cli_ctx, resource_type, *attr_args, mod='models', operation_group=operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/init.py", line 91, in get_sdk
return _sdk_get_versioned_sdk(cli_ctx.cloud.profile, resource_type, *attr_args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 692, in get_versioned_sdk
sdk_path = get_versioned_sdk_path(api_profile, resource_type, operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 684, in get_versioned_sdk_path
api_version = getattr(api_version, operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 479, in getattr
self._resolve()
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 466, in _resolve
for operation_group_name, operation_type in self._client_type.dict.items():
^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'dict'. Did you mean: 'dir'?

Issue script & Debug output

az aks get-credentials --resource-group rg01--name aks01 --overwrite-existing --debug
cli.knack.cli: Command arguments: ['aks', 'get-credentials', '--resource-group', 'rg01', '--name', 'aks01', '--overwrite-existing', '--debug']
cli.knack.cli: init debug log:
Enable color in terminal.
cli.knack.cli: Event: Cli.PreExecute []
cli.knack.cli: Event: CommandParser.OnGlobalArgumentsCreate [<function CLILogging.on_global_arguments at 0x7d8b72dd7880>, <function OutputProducer.on_global_arguments at 0x7d8b72b4e840>, <function CLIQuery.on_global_arguments at 0x7d8b72b93d80>]
cli.knack.cli: Event: CommandInvoker.OnPreCommandTableCreate []
cli.azure.cli.core: Modules found from index for 'aks': ['azext_aks_preview', 'azure.cli.command_modules.acs', 'azure.cli.command_modules.serviceconnector']
cli.azure.cli.core: Loading command modules:
cli.azure.cli.core: Name Load Time Groups Commands
cli.azure.cli.core: acs 0.067 15 79
cli.azure.cli.core: serviceconnector 0.054 20 323
cli.azure.cli.core: Total (2) 0.120 35 402
cli.azure.cli.core: These extensions are not installed and will be skipped: ['azext_ai_examples', 'azext_next']
cli.azure.cli.core: Loading extensions:
cli.azure.cli.core: Name Load Time Groups Commands Directory
cli.knack.cli: Event: CommandLoader.OnLoadCommandTable []
cli.azure.cli.core: aks-preview 0.007 22 103 /home/user/.azure/cliextensions/aks-preview
cli.azure.cli.core: Total (1) 0.007 22 103
cli.azure.cli.core: Loaded 43 groups, 437 commands.
cli.azure.cli.core: Found a match in the command table.
cli.azure.cli.core: Raw command : aks get-credentials
cli.azure.cli.core: Command table: aks get-credentials
cli.knack.cli: Event: CommandInvoker.OnPreCommandTableTruncate [<function AzCliLogging.init_command_file_logging at 0x7d8b71d142c0>]
cli.azure.cli.core.azlogging: metadata file logging enabled - writing logs to '/home/test/.azure/commands/2025-04-25.21-35-47.aks_get-credentials.6780.log'.
az_command_data_logger: command args: aks get-credentials --resource-group {} --name {} --overwrite-existing --debug
cli.knack.cli: Event: CommandInvoker.OnPreArgumentLoad [<function register_global_subscription_argument..add_subscription_parameter at 0x7d8b71d747c0>]
cli.knack.cli: Event: CommandLoader.OnLoadArguments []
cli.azure.cli.core.profiles._shared: Traceback (most recent call last):
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 653, in _get_attr
op = import_module(full_mod_path)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/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/user/.azure/cliextensions/aks-preview/azext_aks_preview/vendored_sdks/azure_mgmt_preview_aks/init.py", line 9, in
from ._container_service_client import ContainerServiceClient
File "/home/user/.azure/cliextensions/aks-preview/azext_aks_preview/vendored_sdks/azure_mgmt_preview_aks/_container_service_client.py", line 19, in
from azure.mgmt.core.tools import get_arm_endpoints
ImportError: cannot import name 'get_arm_endpoints' from 'azure.mgmt.core.tools' (/opt/az/lib/python3.12/site-packages/azure/mgmt/core/tools.py)

cli.azure.cli.core.azclierror: Traceback (most recent call last):
File "/opt/az/lib/python3.12/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/commands/init.py", line 564, in execute
self.commands_loader.load_arguments(command)
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/init.py", line 549, in load_arguments
loader.load_arguments(command) # this adds entries to the argument registries
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/.azure/cliextensions/aks-preview/azext_aks_preview/init.py", line 45, in load_arguments
load_arguments(self, command)
File "/home/user/.azure/cliextensions/aks-preview/azext_aks_preview/_params.py", line 429, in load_arguments
k8s_support_plans = self.get_models(
^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/init.py", line 804, in get_models
return get_sdk(self.cli_ctx, resource_type, *attr_args, mod='models', operation_group=operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/init.py", line 91, in get_sdk
return _sdk_get_versioned_sdk(cli_ctx.cloud.profile, resource_type, *attr_args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 692, in get_versioned_sdk
sdk_path = get_versioned_sdk_path(api_profile, resource_type, operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 684, in get_versioned_sdk_path
api_version = getattr(api_version, operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 479, in getattr
self._resolve()
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 466, in _resolve
for operation_group_name, operation_type in self._client_type.dict.items():
^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'dict'. Did you mean: 'dir'?

cli.azure.cli.core.azclierror: The command failed with an unexpected error. Here is the traceback:
az_command_data_logger: The command failed with an unexpected error. Here is the traceback:
cli.azure.cli.core.azclierror: 'NoneType' object has no attribute 'dict'
Traceback (most recent call last):
File "/opt/az/lib/python3.12/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/commands/init.py", line 564, in execute
self.commands_loader.load_arguments(command)
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/init.py", line 549, in load_arguments
loader.load_arguments(command) # this adds entries to the argument registries
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/.azure/cliextensions/aks-preview/azext_aks_preview/init.py", line 45, in load_arguments
load_arguments(self, command)
File "/home/user/.azure/cliextensions/aks-preview/azext_aks_preview/_params.py", line 429, in load_arguments
k8s_support_plans = self.get_models(
^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/init.py", line 804, in get_models
return get_sdk(self.cli_ctx, resource_type, *attr_args, mod='models', operation_group=operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/init.py", line 91, in get_sdk
return _sdk_get_versioned_sdk(cli_ctx.cloud.profile, resource_type, *attr_args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 692, in get_versioned_sdk
sdk_path = get_versioned_sdk_path(api_profile, resource_type, operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 684, in get_versioned_sdk_path
api_version = getattr(api_version, operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 479, in getattr
self._resolve()
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 466, in _resolve
for operation_group_name, operation_type in self._client_type.dict.items():
^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'dict'. Did you mean: 'dir'?
az_command_data_logger: 'NoneType' object has no attribute 'dict'
Traceback (most recent call last):
File "/opt/az/lib/python3.12/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/commands/init.py", line 564, in execute
self.commands_loader.load_arguments(command)
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/init.py", line 549, in load_arguments
loader.load_arguments(command) # this adds entries to the argument registries
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/user/.azure/cliextensions/aks-preview/azext_aks_preview/init.py", line 45, in load_arguments
load_arguments(self, command)
File "/home/user/.azure/cliextensions/aks-preview/azext_aks_preview/_params.py", line 429, in load_arguments
k8s_support_plans = self.get_models(
^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/init.py", line 804, in get_models
return get_sdk(self.cli_ctx, resource_type, *attr_args, mod='models', operation_group=operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/init.py", line 91, in get_sdk
return _sdk_get_versioned_sdk(cli_ctx.cloud.profile, resource_type, *attr_args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 692, in get_versioned_sdk
sdk_path = get_versioned_sdk_path(api_profile, resource_type, operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 684, in get_versioned_sdk_path
api_version = getattr(api_version, operation_group)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 479, in getattr
self._resolve()
File "/opt/az/lib/python3.12/site-packages/azure/cli/core/profiles/_shared.py", line 466, in _resolve
for operation_group_name, operation_type in self._client_type.dict.items():
^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'dict'. Did you mean: 'dir'?

Expected behavior

Get aks credentials

Environment Summary

az version
{
"azure-cli": "2.71.0",
"azure-cli-core": "2.71.0",
"azure-cli-telemetry": "1.1.0",
"extensions": {
"aks-preview": "14.0.0b4",
"azure-devops": "1.0.1"
}
}

Additional context

No response

[yonzhan]

Thank you for opening this issue, we will look into it.

[levi106]

I encountered a similar error.
In my case, it seems to be caused by _container_service_client.py importing get_arm_endpoints from azure.mgmt.core.tools v1.5.0, while the loaded azure.mgmt.core is actually v1.3.2, which is bundled with the Azure CLI.
As a result, loading ContainerServiceClient fails, causing get_client_class to return None.

[mbifeld]

I believe this has been fixed in the latest aks-preview versions after this PR: Azure/azure-cli#31322. Please reopen / tag me if the issue is still present.