Kaltura_Client_Exception thrown

Invalid KS "NzYxZmFiNDEwMjVmYzRjNjJjYmU5MzllNDJjNjdjMWQ2Mjg5ZTRlMHwxMDE7OzE0OTMzODUxMzc7MjsxNDkzMjk4NzM3Ljc3Mjk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"