Kaltura_Client_Exception thrown

Invalid KS "ZjkzNzZlYTRkODAyNGI3ZTYzNDgxMmVmZmYyMzU5MmU4MTYzMTkyNHwxMDE7OzE0Njk4Mjc1MTg7MjsxNDY5NzQxMTE4Ljc1MzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"