Error Unexpected token <in JSON at position 0. How to solve?

<?php class ControllerCheckoutGuest extends Controller { public function index() { $this->load->language('checkout/checkout'); $data['text_select'] = $this->language->get('text_select'); $data['text_none'] = $this->language->get('text_none'); $data['text_your_details'] = $this->language->get('text_your_details'); $data['text_your_account'] = $this->language->get('text_your_account'); $data['text_your_address'] = $this->language->get('text_your_address'); $data['text_loading'] = $this->language->get('text_loading'); $data['entry_firstname'] = $this->language->get('entry_firstname'); $data['entry_lastname'] = $this->language->get('entry_lastname'); $data['entry_email'] = $this->language->get('entry_email'); $data['entry_telephone'] = $this->language->get('entry_telephone'); $data['entry_fax'] = $this->language->get('entry_fax'); $data['entry_company'] = $this->language->get('entry_company'); $data['entry_customer_group'] = $this->language->get('entry_customer_group'); $data['entry_address_1'] = $this->language->get('entry_address_1'); $data['entry_address_2'] = $this->language->get('entry_address_2'); $data['entry_postcode'] = $this->language->get('entry_postcode'); $data['entry_city'] = $this->language->get('entry_city'); $data['entry_country'] = $this->language->get('entry_country'); $data['entry_zone'] = $this->language->get('entry_zone'); $data['entry_shipping'] = $this->language->get('entry_shipping'); $data['button_continue'] = $this->language->get('button_continue'); $data['button_upload'] = $this->language->get('button_upload'); $data['customer_groups'] = array(); if (is_array($this->config->get('config_customer_group_display'))) { $this->load->model('account/customer_group'); $customer_groups = $this->model_account_customer_group->getCustomerGroups(); foreach ($customer_groups as $customer_group) { if (in_array($customer_group['customer_group_id'], $this->config->get('config_customer_group_display'))) { $data['customer_groups'][] = $customer_group; } } } if (isset($this->request->post['customer_group_id'])) { $data['customer_group_id'] = $this->request->post['customer_group_id']; } elseif(isset($this->session->data['guest']['customer_group_id'])) { $data['customer_group_id'] = $this->session->data['guest']['customer_group_id']; } else { $data['customer_group_id'] = $this->config->get('config_customer_group_id'); } //lightshop start $data['button_back'] = $this->language->get('button_back'); $data['entry_telephone'] = $this->language->get('entry_telephone'); $data['entry_email'] = $this->language->get('entry_email'); $data['checkout_st3_sa'] = $this->config->get('theme_lightshop_checkout_st3_sa'); $this->load->model('catalog/lightshop'); $activeFields = $this->model_catalog_lightshop->getFields($data['customer_group_id']); $allFields = $this->model_catalog_lightshop->getAllFields(); $data['allCustomFields'] = $allFields; foreach($allFields as $field){ $data['entry_'.$field.'_required'] = 0; $data['entry_'.$field.'_show'] = 0; if (isset($this->request->post[$field])) { $data[$field] = $this->request->post[$field]; } elseif (!empty($customer_info)) { $data[$field] = $customer_info[$field]; } else { $data[$field] = ''; } if (isset($this->error[$field])) { $data['error_'.$field] = $this->error[$field]; } else { $data['error_'.$field] = ''; } } foreach($activeFields as $field){ if($field['description']){ $data['entry_'.$field['name']] = $field['description']; } $data['entry_'.$field['name'].'_required'] = $field['required']; $data['entry_'.$field['name'].'_show'] = $field['is_show']; } //lightshop end if (isset($this->session->data['guest']['firstname'])) { $data['firstname'] = $this->session->data['guest']['firstname']; } else { $data['firstname'] = ''; } if (isset($this->session->data['guest']['lastname'])) { $data['lastname'] = $this->session->data['guest']['lastname']; } else { $data['lastname'] = ''; } if (isset($this->session->data['guest']['email'])) { $data['email'] = $this->session->data['guest']['email']; } else { $data['email'] = ''; } if (isset($this->session->data['guest']['telephone'])) { $data['telephone'] = $this->session->data['guest']['telephone']; } else { $data['telephone'] = ''; } if (isset($this->session->data['guest']['fax'])) { $data['fax'] = $this->session->data['guest']['fax']; } else { $data['fax'] = ''; } if (isset($this->session->data['payment_address']['company'])) { $data['company'] = $this->session->data['payment_address']['company']; } else { $data['company'] = ''; } if (isset($this->session->data['payment_address']['address_1'])) { $data['address_1'] = $this->session->data['payment_address']['address_1']; } else { $data['address_1'] = ''; } if (isset($this->session->data['payment_address']['address_2'])) { $data['address_2'] = $this->session->data['payment_address']['address_2']; } else { $data['address_2'] = ''; } if (isset($this->session->data['payment_address']['postcode'])) { $data['postcode'] = $this->session->data['payment_address']['postcode']; } elseif (isset($this->session->data['shipping_address']['postcode'])) { $data['postcode'] = $this->session->data['shipping_address']['postcode']; } else { $data['postcode'] = ''; } if (isset($this->session->data['payment_address']['city'])) { $data['city'] = $this->session->data['payment_address']['city']; } else { $data['city'] = ''; } if (isset($this->session->data['payment_address']['country_id'])) { $data['country_id'] = $this->session->data['payment_address']['country_id']; } elseif (isset($this->session->data['shipping_address']['country_id'])) { $data['country_id'] = $this->session->data['shipping_address']['country_id']; } else { $data['country_id'] = $this->config->get('config_country_id'); } if (isset($this->session->data['payment_address']['zone_id'])) { $data['zone_id'] = $this->session->data['payment_address']['zone_id']; } elseif (isset($this->session->data['shipping_address']['zone_id'])) { $data['zone_id'] = $this->session->data['shipping_address']['zone_id']; } else { $data['zone_id'] = ''; } $this->load->model('localisation/country'); $data['countries'] = $this->model_localisation_country->getCountries(); // Custom Fields $this->load->model('account/custom_field'); $data['custom_fields'] = $this->model_account_custom_field->getCustomFields(); if (isset($this->session->data['guest']['custom_field'])) { if (isset($this->session->data['guest']['custom_field'])) { $guest_custom_field = $this->session->data['guest']['custom_field']; } else { $guest_custom_field = array(); } if (isset($this->session->data['payment_address']['custom_field'])) { $address_custom_field = $this->session->data['payment_address']['custom_field']; } else { $address_custom_field = array(); } $data['guest_custom_field'] = $guest_custom_field + $address_custom_field; } else { $data['guest_custom_field'] = array(); } $data['shipping_required'] = $this->cart->hasShipping(); if (isset($this->session->data['guest']['shipping_address'])) { $data['shipping_address'] = $this->session->data['guest']['shipping_address']; } else { $data['shipping_address'] = true; } // Captcha if ($this->config->get($this->config->get('config_captcha') . '_status') && in_array('guest', (array)$this->config->get('config_captcha_page'))) { $data['captcha'] = $this->load->controller('extension/captcha/' . $this->config->get('config_captcha')); } else { $data['captcha'] = ''; } $this->response->setOutput($this->load->view('checkout/guest', $data)); } public function save() { $this->load->language('checkout/checkout'); $json = array(); // Validate if customer is logged in. if ($this->customer->isLogged()) { $json['redirect'] = $this->url->link('checkout/checkout', '', true); } // Validate cart has products and has stock. if ((!$this->cart->hasProducts() && empty($this->session->data['vouchers'])) || (!$this->cart->hasStock() && !$this->config->get('config_stock_checkout'))) { $json['redirect'] = $this->url->link('checkout/cart'); } // Check if guest checkout is available. if (!$this->config->get('config_checkout_guest') || $this->config->get('config_customer_price') || $this->cart->hasDownload()) { $json['redirect'] = $this->url->link('checkout/checkout', '', true); } if (!$json) { 244 строка---------------- if ((utf8_strlen(trim($this->request->post['firstname'])) < 1) || (utf8_strlen(trim($this->request->post['firstname'])) > 32)) { $json['error']['firstname'] = $this->language->get('error_firstname'); }