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Fatal error: Uncaught Error: Call to undefined function get_header() in C:\xampp\htdocs\sajadwp\wp-content\themes\newtheme\index.php:1 Stack trace: #0 {main} thrown in C:\xampp\htdocs\sajadwp\wp-content\themes\newtheme\index.php on line 1
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Are you building your own theme? get_header() being undefined usually means you aren’t loading WordPress properly e.g. either your theme or the WP core files aren’t where they’re supposed to be.
Are you loading [YOUR_DOMAIN_NAME]/themes/newtheme/index.php in your browser?