Kaltura_Client_Exception thrown

Invalid KS "NTA0MmNlZDQwZmI1NTdmZTQ1OWNjYTRiODdjNWI5ZDVmOWQxMjQ2YnwxMDE7OzE0NzQ4NzUxMDI7MjsxNDc0Nzg4NzAyLjQ4NzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"