maven项目中，使用clean tomcat7：run启动时报如下错误，小白，求大神解救。在pom.xml中已经配置了tomcat7-maven-plugin。
[INFO] Scanning for projects...
[INFO] Downloading from : https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml
[INFO] Downloading from : https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml
[INFO] Downloaded from : https://repo.maven.apache.org/maven2/org/codehaus/mojo/maven-metadata.xml (20 kB at 5.0 kB/s)
[INFO] Downloaded from : https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-metadata.xml (14 kB at 1.3 kB/s)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 10.812 s
[INFO] Finished at: 2019-09-23T21:31:16+08:00
[INFO] ------------------------------------------------------------------------
[ERROR] No plugin found for prefix 'tomcat7' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (D:\MATERIAL\Maven\repository\repository), central (https://repo.maven.apache.org/maven2)] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/NoPluginFoundForPrefixException
https://jingyan.baidu.com/article/ad310e80ef28c81849f49e16.html
这个错误是因为依赖没有下载下来的原因，二种方案，一种是在maven的config.xml 文件中添加配置，一种是在pom 文件中添加 一下配置
<repositories>
<repository>
<id>tchirk-release</id>
<url>http://..../repository/tchirk-release/</url>
</repository>
</repositories>