Kaltura_Client_Exception thrown

Invalid KS "Mjc1ZTM3NTcxYmUyOTU4OGM2MDUxMjdiMDM3NjY1MzJjN2MxNjk3YXwxMDE7OzE0OTA5MDIxMTc7MjsxNDkwODE1NzE3Ljg4Mzg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"