using custom html template Fatal error Uncaught Error: Call to undefined function get_header() - html

Hello I am getting the below error.
Fatal error: Uncaught Error: Call to undefined function get_header() in /home/httpd/vhosts/xyz.in/xyz-dev/index.php:4 Stack trace: #0 {main} thrown in /home/httpd/vhosts/xyz.in/xyz-dev/index.php on line 4
I read a lot of article where I found the reason being of this error that you put the file outside WP container.
I checked my path, all my file is inside the WP-container, under the theme folder. Still getting the same error.
I have deleted the theme and now I don't have any theme. still I am getting the same issue.
Could anyone help me as I am new to WP. I am not able to find the root cause of the issue.
NB -> I am using filezilla to upload the theme folder.

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