Kaltura_Client_Exception thrown

Invalid KS "OWNmMGI1NGVmODBmOTg5ZTE1MDI4MmYzYzlmY2VjYmE4NTI4ZTMzN3wxMDE7OzE0NzUxMDk1MTE7MjsxNDc1MDIzMTExLjkwMDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"