Kaltura_Client_Exception thrown

Invalid KS "ZWUwM2VjZTc0ZjY5M2E0NDg2NzQzYjU4MTY4OTM5YTM2N2M1OGZjZHwxMDE7OzE0NzUxNTc2NTg7MjsxNDc1MDcxMjU4LjA4NTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"