Kaltura_Client_Exception thrown

Invalid KS "NjgzNTlmNGY5M2YyYmI2Y2I2ODM3Mjc4MWY1Mzc4NDE1Mzk2Y2RkZHwxMDE7OzE0NzQ4NTY5NDY7MjsxNDc0NzcwNTQ2LjExMTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"