PHP:在Composer包中使用Phing任务

我创建了一个Composer包，并在其中定义了一个扩展Task的自定义Phing Task。在我的项目中，包括Composer包，我想能够在我的构建文件中使用这个Phing任务，但我一直得到这个错误：

   [taskdef] Error importing generateViews'GenerateView.php
[PHP Error] include_once(generateViews'GenerateView.php): failed to open stream: No such file or directory [line 1058 of C:'Users'Me'Downloads'phing-2.4.13'classes'phing'Phing.php]
[PHP Error] include_once(): Failed opening 'generateViews'GenerateView.php' for inclusion (include_path='C:'Users'Me'Downloads'phing-2.4.13'bin/../classes;.;C:'php'pear') [line 1058 of C:'Users'Me'Downloads'phing-2.4.13'classes'phing'Phing.php]
BUILD FAILED
Error reading project file [wrapped: Error importing generateViews'GenerateView.php]
Total time: 0.1742 seconds

Build finished at 6/28/2015 8:35 PM with exit code 0.

以下是我尝试使用"generateview"任务的构建文件：

<taskdef name="generateview" classname="generateViews.GenerateView" />
 <target name="viewgenerator" >
    <echo msg="Generating View: ${absname}" />
    <generateview name="${absname}"/>
</target>

这是我的实际任务：

namespace tasks'generateViews;
class GenerateView extends 'Task {

这是我的composer.json的自动加载部分。这是我真的不确定的部分。

"autoload": {
  "psr-0": {
    "MyProject": "src/",
    "tasks": "src/tasks",
    "generateViews": "src/tasks/generateViews"
  }
}

如果有帮助，我的项目结构如下：

MyProject
   src
      tasks
         generateViews
      otherStuff
         view
   tests