error 500 prestashop  

al intentar entrar en facturas, del backoffice me da error 500, pongo debug y me sale el siguiente mensaje

Symfony Exception
Symfony Docs
Symfony Support
UnexpectedTypeException
HTTP 500 Internal Server Error
Expected argument of type "object, array or empty", "string" given

Exception Logs 2 Stack Trace

SymfonyComponentFormException UnexpectedTypeException
in vendor/symfony/symfony/src/Symfony/Component/Form/Extension/Core/DataMapper/PropertyPathMapper.php (line 41)
PropertyPathMapper->mapDataToForms('', object(RecursiveIteratorIterator)) in vendor/symfony/symfony/src/Symfony/Component/Form/Form.php (line 379)
Form->setData('') in vendor/symfony/symfony/src/Symfony/Component/Form/Extension/Core/DataMapper/PropertyPathMapper.php (line 49)
PropertyPathMapper->mapDataToForms(array('enable_invoices' => true, 'enable_tax_breakdown' => false, 'enable_product_images' => true, 'invoice_prefix' => array('#FA'), 'add_current_year' => true, 'reset_number_annually' => true, 'year_position' => 0, 'invoice_number' => 0, 'legal_free_text' => '', 'footer_text' => array('ANHELSPORT EVENTS S.L. NIF B553011428'), 'invoice_model' => 'invoice-b2b', 'use_disk_cache' => false), object(RecursiveIteratorIterator)) in vendor/symfony/symfony/src/Symfony/Component/Form/Form.php (line 379)
Form->setData(array('enable_invoices' => true, 'enable_tax_breakdown' => false, 'enable_product_images' => true, 'invoice_prefix' => array('#FA'), 'add_current_year' => true, 'reset_number_annually' => true, 'year_position' => 0, 'invoice_number' => 0, 'legal_free_text' => '', 'footer_text' => array('ANHELSPORT EVENTS S.L. NIF B553011428'), 'invoice_model' => 'invoice-b2b', 'use_disk_cache' => false)) in vendor/symfony/symfony/src/Symfony/Component/Form/Extension/Core/DataMapper/PropertyPathMapper.php (line 49)
PropertyPathMapper->mapDataToForms(array('invoice_options' => array('enable_invoices' => true, 'enable_tax_breakdown' => false, 'enable_product_images' => true, 'invoice_prefix' => array('#FA'), 'add_current_year' => true, 'reset_number_annually' => true, 'year_position' => 0, 'invoice_number' => 0, 'legal_free_text' => '', 'footer_text' => array('ANHELSPORT EVENTS S.L. NIF B553011428'), 'invoice_model' => 'invoice-b2b', 'use_disk_cache' => false)), object(RecursiveIteratorIterator)) in vendor/symfony/symfony/src/Symfony/Component/Form/Form.php (line 379)
Form->setData(array('invoice_options' => array('enable_invoices' => true, 'enable_tax_breakdown' => false, 'enable_product_images' => true, 'invoice_prefix' => array('#FA'), 'add_current_year' => true, 'reset_number_annually' => true, 'year_position' => 0, 'invoice_number' => 0, 'legal_free_text' => '', 'footer_text' => array('ANHELSPORT EVENTS S.L. NIF B553011428'), 'invoice_model' => 'invoice-b2b', 'use_disk_cache' => false))) in vendor/symfony/symfony/src/Symfony/Component/Form/Form.php (line 483)
Form->initialize() in vendor/symfony/symfony/src/Symfony/Component/Form/FormBuilder.php (line 226)
FormBuilder->getForm() in src/Core/Form/FormHandler.php (line 114)

[
'form_builder' => &$this->formBuilder,
]
);
return $this->formBuilder->getForm();
}
/**
* {@inheritdoc}
*

FormHandler->getForm() in src/PrestaShopBundle/Controller/Admin/Sell/Order/InvoicesController.php (line 57)
InvoicesController->indexAction(object(Request)) in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php (line 151)
HttpKernel->handleRaw(object(Request), 1) in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php (line 68)
HttpKernel->handle(object(Request), 1, false) in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php (line 200)
Kernel->handle(object(Request), 1, false) in x5jj4ay58nzx411l/index.php (line 88)

si entro en facturas por abono funciona, y si voy pedido a pedido y saco las facturas tambien, solo la pagina "facturas" no abre