Kaltura_Client_Exception thrown

Invalid KS "NjM2YjZjN2IwMTFkZmM1NDEzYjAyZGZmOTEwODk3YzMxMzgwMmM3YnwxMDE7OzE0ODgwMTI1Nzc7MjsxNDg3OTI2MTc3LjQwMjk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"