Kaltura_Client_Exception thrown

Invalid KS "YWE5NDBlZDZmYWViZmUyODg4YzI2NGExZTc1NTU0MjEwNWE2N2M1ZHwxMDE7OzE0ODExMTk3NDU7MjsxNDgxMDMzMzQ1LjQwOTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"