Why does a white page appear in 1s Bitrix?

Question

1C-Bitrix

To be honest, I don’t know what happened, I edited the catalog complex template, everything worked fine, but then I changed the parameter the number of displayed elements per page and the number of elements per line, saved it, and now a white screen pops up in the complex component, no matter what page you go to. ., I tried to insert the standard settings, it's still a white screen .... Tell me which way to dig?
I'm just getting to know Bitrix...

Answer 1

There are so many options why you have a white screen - enable debugging in /bitrix/.settings.php and everything will be clear:
'debug' => true,

Answer 2

What does the web server error console say?