(404) when calling the HeadObject operation: Not Found - python-3.x

Question

I am trying to download a file from S3, I have already check, the file path is correct, the bucket do exist and my lambda function have fullAdmin Access to S3
def download_file():
s3_bucket_name = os.getenv("BUCKET_NAME")
file_key=os.getenv("FILE_NAME")
try:
s3_client.download_file(s3_bucket_name, file_key, 'user-data')
except Exception as e:
raise e
When my code is ran I get the following errors.
{
"errorMessage": "An error occurred (404) when calling the HeadObject operation: Not Found",
"errorType": "ClientError",
"requestId": "e2145aa0-8ab6-4448-a410-d05fa8b3795f",
"stackTrace": [
" File \"/var/task/lambda_function.py\", line 106, in lambda_handler\n user_list = read_agent_list(h_group)\n",
" File \"/var/task/lambda_function.py\", line 100, in read_agent_list\n return map_agents_to_hgroup(userList,h_group)\n",
" File \"/var/task/lambda_function.py\", line 24, in map_agents_to_hgroup\n download_file()#download the file to update\n",
" File \"/var/task/lambda_function.py\", line 82, in download_file\n raise e\n",
" File \"/var/task/lambda_function.py\", line 80, in download_file\n s3_client.download_file(s3_bucket_name, file_key, 'user-data')\n",
" File \"/var/runtime/boto3/s3/inject.py\", line 171, in download_file\n return transfer.download_file(\n",
" File \"/var/runtime/boto3/s3/transfer.py\", line 307, in download_file\n future.result()\n",
" File \"/var/runtime/s3transfer/futures.py\", line 106, in result\n return self._coordinator.result()\n",
" File \"/var/runtime/s3transfer/futures.py\", line 265, in result\n raise self._exception\n",
" File \"/var/runtime/s3transfer/tasks.py\", line 255, in _main\n self._submit(transfer_future=transfer_future, **kwargs)\n",
" File \"/var/runtime/s3transfer/download.py\", line 340, in _submit\n response = client.head_object(\n",
" File \"/var/runtime/botocore/client.py\", line 386, in _api_call\n return self._make_api_call(operation_name, kwargs)\n",
" File \"/var/runtime/botocore/client.py\", line 705, in _make_api_call\n raise error_class(parsed_response, operation_name)\n"
]
}