Kaltura_Client_Exception thrown

Invalid KS "MzE3ZTI5NjVjNDVlYjI4MTNjZWU3NDczMjdkYWMzNDg4YWI1M2NhM3wxMDE7OzE0NzQ5NjIwOTE7MjsxNDc0ODc1NjkxLjgzMTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"