SOLVED Error 500 for BO, front end seems to be working

[vampira]

Hello!

Shop runs on PS 1.7.8.8., purchased theme. Today morning, when I was trying to access the login page for BO, I got error 500: 

This page isn’t working

domain.com is currently unable to handle this request.

HTTP ERROR 500

I opened config/defines.inc.php file, looked up: define('_PS_MODE_DEV_', false); and replaced it with: define('_PS_MODE_DEV_', true);

and got this info:

Whoops, looks like something went wrong.

(1/1) IOException

A temporary file could not be created.

in Filesystem.php line 637

at Filesystem->tempnam('/shop/var/cache/dev', 'appDevDebugProjectContainer.xml')in Filesystem.php line 685

at Filesystem->dumpFile('/shop/var/cache/dev/appDevDebugProjectContainer.xml', '<?xml version="1.0" encoding="utf-8"?><container xmlns="http://symfony.com/schema/dic/services" x

...................... gazillion lines.............................................

="tactician.command.debug" public="true"/> </services></container>')in ResourceCheckerConfigCache.php line 124

at ResourceCheckerConfigCache->write('<?xml version="1.0" encoding="utf-8"?><container xmlns="http://symfony.com/schema/dic/services" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://symfony.com/schema/dic/services https://symfony.com/schema/dic/services/services-

...................... gazillion lines.............................................

object(ReflectionClassResource)))in ContainerBuilderDebugDumpPass.php line 32

at ContainerBuilderDebugDumpPass->process(object(ContainerBuilder))in Compiler.php line 140

at Compiler->compile(object(ContainerBuilder))in ContainerBuilder.php line 789

at ContainerBuilder->compile()in Kernel.php line 643

at Kernel->initializeContainer()in Kernel.php line 135

at Kernel->boot()in Kernel.php line 195

at Kernel->handle(object(Request), 1, false)in index.php line 82

 

Front end is working apparently. What should I do, so I could access BO again?

 

Edited January 25 by vampira
Marked solved (see edit history)

[juanrojas]

Hello, try deleting the cache via FTP to see if it changes anything

[vampira]

Thank you, it worked!