Kaltura_Client_Exception thrown

Invalid KS "NzkxZTlmNTViMDFmNmY5YWJkMDdjZWZjZGIzY2VjNmI1ZjEyZGU4NHwxMDE7OzE0OTU4MDM0NjI7MjsxNDk1NzE3MDYyLjAxOTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"