在Maven发布插件上构建失败

我是Maven的新手,我在一个使用父pom文件的多模块项目中被分配.我想将快照项目更改为发布.即使我添加了scm标签和Maven发布插件,发布:准备目标仍然失败.

这是我在父pom.xml文件中添加的内容:

 
        ...
        
            scm:git:http://localhost:8181/gitblit
             /r/server/myCompany.git
        
        ...


        //And the plugin:
        
            org.apache.maven.plugins
            maven-release-plugin
            2.5.3
        
        ...
        

这是错误:

错误是这样的:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-release-            
          plugin:2.5.3:prepare (default-cli) on 
          project myParentProject: Unable to commit files
[ERROR] Provider message:
[ERROR] The git-add command failed.
[ERROR] Command output:
[ERROR] 'git' is not recognized as an internal or external command,
[ERROR] operable program or batch file..

提前致谢!