Kaltura_Client_Exception thrown

Invalid KS "NDU3MzRkNGVmMTQ0YTk1MDk1MTFmNDgzMTNmOTE2ZWM4NWYyMWJmZXwxMDE7OzE0ODEzMzUwOTU7MjsxNDgxMjQ4Njk1Ljc2MTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"