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I had clear the cache of my website and after this I am getting this error while login into the dashboard. 

HTTP 500 error

That’s odd... the website can’t display this page

 

I manage to get th Debug Mode from FTP and this Error I get

 

(1/1) ParameterNotFoundException

You have requested a non-existent parameter "mailer_user".

in ParameterBag.php line 102

at ParameterBag->get('mailer_user')

in EnvPlaceholderParameterBag.php line 57

at EnvPlaceholderParameterBag->get('mailer_user')

in ParameterBag.php line 219

at ParameterBag->resolveString('%mailer_user%', array('mailer_user' => true))

in ParameterBag.php line 189

at ParameterBag->resolveValue('%mailer_user%', array())

in ParameterBag.php line 179

at ParameterBag->resolveValue(array('transport' => '%mailer_transport%', 'host' => '%mailer_host%', 'username' => '%mailer_user%', 'password' => '%mailer_password%', 'spool' => array('type' => 'memory')), array())

in ParameterBag.php line 179

at ParameterBag->resolveValue(array(array('transport' => '%mailer_transport%', 'host' => '%mailer_host%', 'username' => '%mailer_user%', 'password' => '%mailer_password%', 'spool' => array('type' => 'memory'))))

in MergeExtensionConfigurationPass.php line 57

at MergeExtensionConfigurationPass->process(object(ContainerBuilder))

in MergeExtensionConfigurationPass.php line 39

at MergeExtensionConfigurationPass->process(object(ContainerBuilder))

in Compiler.php line 141

at Compiler->compile(object(ContainerBuilder))

in ContainerBuilder.php line 778

at ContainerBuilder->compile()

in Kernel.php line 641

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 88

 

 PrestaShop's 1.7