Kaltura_Client_Exception thrown

Invalid KS "YjBiNjk3NWE4Y2UzZjJiYzgyNjVmNjFkM2U2OGNiYjY2Mzc3MTk5OHwxMDE7OzE0ODEzMzQ5MTY7MjsxNDgxMjQ4NTE2LjI2NTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"