Kaltura_Client_Exception thrown

Invalid KS "Njc5YjY0MzVhOWJlNWMyYzBjYmNmMGFhZWIxOTgxMTA3MTljMzA4YXwxMDE7OzE0ODE1Mzc0MzI7MjsxNDgxNDUxMDMyLjU2Mjc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"