BO not loading - Error 500

[ariko]

Hello, 

BO is generating error 500. Version is 1.7.3.0 php is 7.0. The issue happened after hitting save button on a module's translation page. After that BO generating error 500 but FO is working. Here is the error: 

Quote

1/1RuntimeException in PhpDumper.php line 1403:

Cannot dump definition because of invalid class name (NULL)

in PhpDumper.php line 1403

at PhpDumper->dumpLiteralClass('NULL') in PhpDumper.php line 790

at PhpDumper->addNewInstance('_defaults', object(Definition), 'return ', '$this->services['_defaults'] = ') in PhpDumper.php line 394

at PhpDumper->addServiceInstance('_defaults', object(Definition)) in PhpDumper.php line 639

at PhpDumper->addService('_defaults', object(Definition)) in PhpDumper.php line 666

at PhpDumper->addServices() in PhpDumper.php line 145

at PhpDumper->dump(array('class' => 'appDevDebugProjectContainer', 'base_class' => 'Container', 'namespace' => '', 'debug' => true, 'file' => '/var/www/clients/client1/web1/web/app/cache/dev/appDevDebugProjectContainer.php')) in bootstrap.php.cache line 2846

at Kernel->dumpContainer(object(ConfigCache), object(ContainerBuilder), 'appDevDebugProjectContainer', 'Container') in bootstrap.php.cache line 2759

at Kernel->initializeContainer() in bootstrap.php.cache line 2533

at Kernel->boot() in bootstrap.php.cache line 2564

at Kernel->handle(object(Request), '1', false) in index.php line 86

Any advice and help will be appreciated. Thank you. 

 

[tuk66]

Disable Debug mode and it should work.

[ariko]

1 minute ago, tuk66 said:

Disable Debug mode and it should work.

Unfortunately it's not working. When debug mode is disabled I got HTTP ERROR 500 (blank page)

Apache error log contains the same log as above. 

[tuk66]

I would only suggest to upgrade. It can be a bug in this rather old version.

[ariko]

2 minutes ago, tuk66 said:

I would only suggest to upgrade. It can be a bug in this rather old version.

It seems like this is the only option left ...

Thanks!

[tuk66]

The second option is to find the root of this problem. Unfortunately, that error message doesn't show it. In these cases, I usually debug it right on the server.

[ariko]

2 minutes ago, tuk66 said:

The second option is to find the root of this problem. Unfortunately, that error message doesn't show it. In these cases, I usually debug it right on the server.

Can you give me a hind what you mean by "right on the server" error log contain even less info than the one in my first post 

Here is the error_log message:

Quote

AH01071: Got error 'PHP message: PHP Fatal error:  Uncaught Symfony\\Component\\DependencyInjection\\Exception\\RuntimeException: Cannot dump de
finition because of invalid class name (NULL) in /var/www/clients/client1/web1/web/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php:1403\nStack trace:\n#0 /var/www/clients/client1/web1/web/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php(790): Symfony\\Component\\DependencyInjection\\Dumper\\PhpDumper->dumpLiteralClass('NULL')\n#1 /var/www/clients/client1/web1/web/vendor/symfony/symfony/src/Symfon
y/Component/DependencyInjection/Dumper/PhpDumper.php(394): Symfony\\Component\\DependencyInjection\\Dumper\\PhpDumper->addNewInstance('_defaults', Object(Symfony\\Component\\DependencyInjection\\Definition), 'return ', '$this->services..
.')\n#2 /var/www/clients/client1/web1/web/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php(639): Symfony\\Component\\DependencyInjection\\Dumper\\PhpDumper->addServiceInst...\n'

 

[tuk66]

Almost no server allows you to enable XDebug on the server (I know one). But you can patch the files to write down logs. There is no exact rule how to do it. Usually, I start somewhere and continue in other files according to interim results.