truffle migrate时报错：
Error: *** Deployment Failed ***
"Migrations" could not deploy due to insufficient funds
truffle test时报错：
Error: while migrating Migrations: Returned error: sender doesn't have enough funds to send tx. The upfront cost is: 134439500000000000 and the sender's account only has: 0
这是因为账户没钱了，解决方法：打开ganache
点击设置
把balance改大点
limit设置大一点，gas price设置小点，再点右上角restart
关闭ganache,重新打开ganache，可以看到账户余额都变了
再部署或测试就不会报这个错了。
