Kaltura_Client_Exception thrown

Invalid KS "MmMyM2Y0ZmE1NjlhYWM0MDQxMjUxNTJmNzc1Njg4NzVmMWFlNmQxYnwxMDE7OzE0ODE1NTE5ODA7MjsxNDgxNDY1NTgwLjA3NDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"