Update 8.4.2 to 9 /(output started at /crm/install/entry.php:37

[rucrm]

WARNING: E_WARNING: Cannot modify header information - headers already sent by (output started at /home/123/public_html/crm/install/entry.php:37)
I have this error
8.4.2 to 9
Current version is 8.4.2.
EspoCRM will be upgraded to version 9.0.8 now. Enter [Y] to continue.
y
This may take a while. Do not close the terminal.
Downloading...

[shalmaxb]

Log File would be better, but probably timeouts because of lo execution time and input time in your server configuration.