Kaltura_Client_Exception thrown

Invalid KS "YWRjYmI5MTZhYzA4NzRjZjZiOWZlZGFhY2U4YWJiMTFjNWViNDQyN3wxMDE7OzE0OTAzNDM5Njg7MjsxNDkwMjU3NTY4LjgyNDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"