Error 503

Hi, I place my question on the german forum because there are a lot more people here. You can response in German i will understand. I get the following message when i will enter de settings. Error 503 service unavailable Fatal error: Uncaught exception ‚Zend_Json_Exception‘ with message ‚Decoding failed: Syntax error‘ in /home/studiosh/domains/kievitssupport.com/public_html/shop/engine/Library/Zend/Json.php:93 Stack trace: #0 /home/studiosh/domains/kievitssupport.com/public_html/shop/engine/Library/Enlight/Controller/Plugins/JsonRequest/Bootstrap.php(105): Zend_Json::decode(’[{„property“:…’) #1 [internal function]: Enlight_Controller_Plugins_JsonRequest_Bootstrap->onPreDispatch(Object(Enlight_Controller_ActionEventArgs)) #2 /home/studiosh/domains/kievitssupport.com/public_html/shop/engine/Library/Enlight/Event/Handler/Default.php(91): call_user_func(Array, Object(Enlight_Controller_ActionEventArgs)) #3 /home/studiosh/domains/kievitssupport.com/public_html/shop/engine/Library/Enlight/Event/EventManager.php(211): Enlight_Event_Handler_Default->execute(Object(Enlight_Controller_ActionEventArgs)) #4 /home/studiosh/domains/kievitssupport.com/public_html/shop/engine/Library/Enlight/Controller/Action.php(138): Enlight_Event_EventManager->not in /home/studiosh/domains/kievitssupport.com/public_html/shop/engine/Library/Zend/Json.php on line 93 503 Service Unavailable I hope somebody know whats wrong. Thanks