Kaltura_Client_Exception thrown

Invalid KS "NmMzNDQ1ZDA0NjU4MDk5NDYzMzI3MTliZDZhODViMzY0ZTc4NjJhN3wxMDE7OzE0OTg3Mjk0MzY7MjsxNDk4NjQzMDM2LjQ3Njg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"