Kaltura_Client_Exception thrown

Invalid KS "MzNjNGM4NjIzOWQ1NDZhMjFkZTc0ZGRhMDc3MGUxODkwNTlmMGYxMnwxMDE7OzE1MDExMDEwMzQ7MjsxNTAxMDE0NjM0Ljk1Nzg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"