Kaltura_Client_Exception thrown

Invalid KS "NzU3ZGM2NTQzMmViNzJjN2ZlMDU3Y2VkMGE4MTE3NDYwNjVmMTdiN3wxMDE7OzE0OTg2MDkwOTM7MjsxNDk4NTIyNjkzLjk2Nzc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"