Kaltura_Client_Exception thrown

Invalid KS "YjJhMmEyOTczOThlNjkzMGU0ZWUwMDExYjkxNWU3NmYxNGE3ZDc4ZnwxMDE7OzE0ODE0MTMyNTQ7MjsxNDgxMzI2ODU0LjMxMDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"