Kaltura_Client_Exception thrown

Invalid KS "Y2IxOGNjM2FhZjIwMjVjOGFiMTg4NzI5ZWI4YjQyNmZhZTk5ZDFkN3wxMDE7OzE0NzUxODM3NDc7MjsxNDc1MDk3MzQ3Ljk1NjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"