ReferenceError: key is not defined     at Vo.signHmacSha1 (index.js? [sm]:66)     at Vo.initMqttOptions (index.js? [sm]:52)     at Vo.doConnect (index.js? [sm]:17)     at Vo.onLoad (index.js? [sm]:8)     at Vo.<anonymous> (VM977 WAService.js:2)     at Vo.a.__callPageLifeTime__ (VM977 WAService.js:2)     at un (VM977 WAService.js:2)     at VM977 WAService.js:2     at gn (VM977 WAService.js:2)     at r.<anonymous> (VM977 WAService.js:2)(env: Windows,mp,1.05.2201240; lib: 2.19.4)