"SpecNotFound: Invalid name, try the format: user/package" in Creating new Conda env with yml file (Windows 10)

I'm trying to Create New conda environment by 'Anaconda Prompt' usnig yml File in Windows 10.
So here is the steps i made through:

1. using cd command i changed the directory to dir which my yml file located. (suppose my yml file is in c:/Users/<USER NAME>/.jupyter )
2. Then i used conda env create -f Python 310.yml command to create new conda env.

and what i got is:

SpecNotFound: Invalid name, try the format: user/package

Now I don't know how can I solve this problem and exactly what is the meaning of this error.

Appendix

my Python 310.yml file contains these stuff:

Solution

issue solved by changing contents of Python 310.yml and renaming yml file to Python310.yml. Here is the final .yml file content:

name: Python3.9 
channels:
  - defaults
dependencies:
  - numpy
  - pandas
  - matplotlib
  - pip
  - python=3.9.*      
  - python-dateutil
  - pytz
  - scikit-learn
  - scipy
  - statsmodels
  - xlrd
  - openpyxl
  - lxml
  - html5lib
  - beautifulsoup4
  - jupyter
  - pip:
    - pmdarima        
    - tensorflow
    - keras
prefix: C:\Users\Shayan\Anaconda3\envs\Python3.9