Kaltura_Client_Exception thrown

Invalid KS "MDA4OTA0MDUxNzliOTllOTJiMDljOGZmYWFjNTgzYTFjN2UwNjc2OXwxMDE7OzE0OTA1MzU3NTI7MjsxNDkwNDQ5MzUyLjY4ODE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"