mysqli :: real_connect（）:( HY000 / 2002）：无法建立连接，因为目标计算机主动拒绝它

I've this problem when I'm trying to run my PHP MySQL script. When I try to run my .php file this is what I get.

A PHP Error was encountered

Severity: Warning

Message: mysqli::real_connect(): (HY000/2002): No connection could be made because the target machine actively refused it.

Filename: mysqli/mysqli_driver.php

Line Number: 135

Backtrace:

File: C:\wamp\www\acc\index.php Line: 292 Function: require_once

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mysqli :: real_connect（）:( HY000 / 2002）：无法建立连接，因为目标计算机主动拒绝它

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mysqli :: real_connect（）:( HY000 / 2002）：无法建立连接，因为目标计算机主动拒绝它

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