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Cannot install Astra Starter Templates Pulgin – Error 404. In my php_error.log I have an error caused by an echo before a function call [closed]

PHP Warning:  Cannot modify header information - headers already sent by (output started at /data/web/e112317/html/apps/wordpress-133411/wp-includes/script-loader.php:2665) in /data/web/e112317/html/apps/wordpress-133411/wp-includes/pluggable.php on line 1355

this is the error in my php_error.log

and this is line 2664-2666 in my script-loader.php
function wp_print_inline_script_tag( $javascript, $attributes = array() ) { echo wp_get_inline_script_tag( $javascript, $attributes ); }

Any Ideas how to fix that? I tried removing the echo, had no effect though. I have no clue about php by the way.