Allure Report unknown unknown - NoN%

I am newbie to allure and Pytest. I have created testcases inPpytest framework. For reporting I am using allure. when I execute the allure serve <Reporting foldername> command report shown as NoN%. Is there any plugin missing?

I did not understand where I went wrong. Can anybody assist me to resolve this issue?

When I run

pytest --alluredir=Reports

JSON files are created instead of XML.

Then, I executed

allure generate allure-reports

inside Report folder. When I run allure serve allure-reports, report shown as Non% even though 5 test cases passed.

Report image:

Pytest report image:

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