crypto-js decryption error malformed utf-8 data

Malformed UTF-8 data Error: Malformed UTF-8 data at (d:\StudeyCode\myStudy\encryptDemo\routes\encrypt\crypto-:478:27) at (d:\StudeyCode\myStudy\encryptDemo\routes\encrypt\crypto-:215:41) at decryptByDESModeCBC (d:\StudeyCode\myStudy\encryptDemo\routes\encrypt\crypto.js:90:22) at testSign (d:\StudeyCode\myStudy\encryptDemo\routes\test.js:34:18) at [as handle_request] (d:\StudeyCode\myStudy\encryptDemo\node_modules\express\lib\router\layer.js:95:5) at next (d:\StudeyCode\myStudy\encryptDemo\node_modules\express\lib\router\route.js:137:13) at (d:\StudeyCode\myStudy\encryptDemo\node_modules\express\lib\router\route.js:112:3) at [as handle_request] (d:\StudeyCode\myStudy\encryptDemo\node_modules\express\lib\router\layer.js:95:5) at d:\StudeyCode\myStudy\encryptDemo\node_modules\express\lib\router\index.js:281:22 at Function.process_params (d:\StudeyCode\myStudy\encryptDemo\node_modules\express\lib\router\index.js:335:12)