tomcat7运行报错A child container failed during start

大概也查了资料，说是pom配置文件哪里导入的依赖冲突了。但是我给了作用域

```xml
<scope>provided<scope>

```

删除版本号：

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>