Kaltura_Client_Exception thrown

Invalid KS "Y2ZmMmNhNWQ4MmJlOWFmOWQ5YTMxYTdhOWI1YWExODdjM2VjMzkwNXwxMDE7OzE0OTMxMTI5NDg7MjsxNDkzMDI2NTQ4Ljk0ODc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"