I was setting again the first. but I couldnot completion...

[okazgumi]

http://www.grassland.space/install/index.php

[okazgumi]

when I check error_log, the errorrog tells me php-error.

[DanielnetoDotCom]

check /var/logs/apache2/error.log and /var/www/YouPHPTube/videos/youphptube.log
Paste here the results
tail /var/logs/apache2/error.log

tail /var/www/YouPHPTube/videos/youphptube.log

[okazgumi]

This server doesn't have "logs" directory...

[okazgumi]

[04-Jun-2017 12:40:18 Asia/Tokyo] PHP Fatal error: Uncaught Error: Class 'mysqli' not found in /var/www/html/install/checkConfiguration.php:16
Stack trace:
#0 {main}
thrown in /var/www/html/install/checkConfiguration.php on line 16

[DanielnetoDotCom]

Did you follow this tutorial?
https://github.com/DanielnetoDotCom/YouPHPTube/wiki/How-to-install-LAMP,--FFMPEG-and-Git-on-a-fresh-Ubuntu-16.x
you probably need to install php-mysql

[okazgumi]

Thanks!
Why does the user jump to the user page when the user clicks the upload or import link?

[DanielnetoDotCom]

Bucause you need to be logged as admin to upload, or give permition to regular users to upload too