blockchain wallet service ubuntu installation error

i need some help am getting this error when starting the service i have followed all steps but getting this error

blockchain-wallet-service start --port 3030 1497723591039 - error: Error: Unsupported crypto version at Object.<anonymous> (/usr/local/lib/node_modules/blockchain-wallet-service/node_modules/bip39/node_modules/pbkdf2/index.js:4:9) at Module._compile (module.js:456:26) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Module.require (module.js:364:17) at require (module.js:380:17) at Object.<anonymous> (/usr/local/lib/node_modules/blockchain-wallet-service/node_modules/bip39/index.js:3:14) at Module._compile (module.js:456:26) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Module.require (module.js:364:17) at require (module.js:380:17) at Object.<anonymous> (/usr/local/lib/node_modules/blockchain-wallet-service/src/create.js:4:13) at Module._compile (module.js:456:26) 1497723591054 - error: TypeError: Cannot call method 'start' of undefined at start (/usr/local/lib/node_modules/blockchain-wallet-service/bin/cli.js:58:10) at Timer.listOnTimeout [as ontimeout] (timers.js:110:15)