Kaltura_Client_Exception thrown

Invalid KS "YmNjNGViMDM1ZjJkN2NiMGQzMzM1M2E5Y2VjMzM5N2YzNDU2YmNkN3wxMDE7OzE0NzUxNjQ2Mzg7MjsxNDc1MDc4MjM4Ljk2NTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"