Kaltura_Client_Exception thrown

Invalid KS "MDg0N2Y4MDRhZDI2NzBmNmNkZDJhYmU2OWZlOWY5MmRkNWQ3OTk3NnwxMDE7OzE0NzUxMzk0MTM7MjsxNDc1MDUzMDEzLjYzMTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"