Error 500 upgrading

[JOSSm]

Hi im upgrading from 1.7.6.9 to 1.7.8 with 1 click upgrade. files have been upgraded but now database It's been like this for about two hours:

All files upgraded. Now upgrading database...

 

And now my web has 500 error and activating dev mode i have this:

Whoops, looks like something went wrong.

(1/1) ReflectionException

The autoloader expected class "PrestaShopBundle\Controller\Admin\Sell\index" to be defined in file "/home/relojeae/web/relojea.es/public_html/vendor/composer/../../src/PrestaShopBundle/Controller/Admin/Sell/index.php". The file was found but the class was not in it, the class name or namespace probably has a typo.

in ClassExistenceResource.php line 72

at ClassExistenceResource->isFresh(0)in ContainerBuilder.php line 371

at ContainerBuilder->getReflectionClass('PrestaShopBundle\\Controller\\Admin\\Sell\\index')in RegisterControllerArgumentLocatorsPass.php line 67

at RegisterControllerArgumentLocatorsPass->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

 

Please help