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# ask-community
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Guillaume Balaine

07/05/2023, 7:29 AM
Hi team, I'm trying to run dagster on ECS, and getting a little frustrated with the following error :
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dagster._check.ParameterCheckError: Param "image" is not a str. Got None which is type <class 'NoneType'>.
From the docs, dagster is supposed to derive the image name from the ecs task definition of dagit or the daemon, but it looks like this isn't the case. Is there any way to get dagster running without a dedicated user code repository cluster on ECS ?
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Complete trace
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dagster._check.ParameterCheckError: Param "image" is not a str. Got None which is type <class 'NoneType'>.
  File "/usr/local/lib/python3.11/site-packages/dagster/_daemon/run_coordinator/queued_run_coordinator_daemon.py", line 332, in _dequeue_run
    instance.run_launcher.launch_run(LaunchRunContext(dagster_run=run, workspace=workspace))
  File "/usr/local/lib/python3.11/site-packages/dagster_aws/ecs/launcher.py", line 383, in launch_run
    run_task_kwargs = self._run_task_kwargs(run, image, container_context)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/dagster_aws/ecs/launcher.py", line 627, in _run_task_kwargs
    task_definition_config = DagsterEcsTaskDefinitionConfig.from_task_definition_dict(
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/dagster_aws/ecs/tasks.py", line 142, in from_task_definition_dict
    return DagsterEcsTaskDefinitionConfig(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/dagster_aws/ecs/tasks.py", line 61, in __new__
    check.str_param(image, "image"),
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/dagster/_check/__init__.py", line 1347, in str_param
    raise _param_type_mismatch_exception(obj, str, param_name, additional_message)
Solved, the DAGSTER_CURRENT_IMAGE needs to be set in dagit
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