Kaltura_Client_Exception thrown

Invalid KS "ZmQ0NTEyODFmMWVlMzVlMjQzODI2NzkxNmNiODI1ZDQ5OGFiNWUzOXwxMDE7OzE0ODgyNDgwNzU7MjsxNDg4MTYxNjc1Ljk2NTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"