Ethereum Blockchain app connector (Deploy smart contract) does not work

> Please provide us with the following information:
> ---------------------------------------------------------------

### This issue is for a: (mark with an `x`)
```
- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
>
Following the post, I put a Ethereum Blockchain app connector (Deploy smart contract) immediately after a SQL Server Connector

This is the error information.
{
"status": 400,
"message": "Encountered RPC error when establishing communicating with the blockchain network -32000: method handler crashed\r\nclientRequestId: 34181963-9f72-4931-8821-124d2bc57258",
"error": {
"message": "Encountered RPC error when establishing communicating with the blockchain network -32000: method handler crashed"
},
"source": "blockchainethereum-sea.azconn-sea.p.azurewebsites.net"
}

### Any log messages given by the failure
>
N/A
### Expected/desired behavior
>
Contract can be created successfully

### OS and Version?
> Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

### Versions
>

### Mention any other details that might be useful

> ---------------------------------------------------------------
> Thanks! We'll be in touch soon.

未指定源文件或测试。首先，在 SQL Server Connector 之后立即复现 Ethereum Blockchain app connector 的 Deploy smart contract 步骤，并检查报告的 RPC -32000 错误。合约能够成功创建且不再出现 method-handler 失败，即表示完成。

由索引模型根据 Issue 内容生成。