annotated as a component, but the type is not a concrete class. NOT adding to index file!!

[JinquanZhang]

I'm trying to start a study of develop a confluence plugin using the Atlassion SDK. but after I start the skeleton demonstration mvn project, it show errors as follows, what' the problem?

Error Info

[INFO] --- atlassian-spring-scanner-maven-plugin:1.2.13:atlassian-spring-scanner (default) @ confluence.db ---
[INFO] Starting Atlassian Spring Byte Code Scanner...
[INFO]
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.imports.StashImport] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.imports.RefappImport] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.imports.JiraImport] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.imports.FecruImport] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.imports.ConfluenceImport] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.imports.BitbucketImport] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.imports.BambooImport] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.export.ModuleType] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.component.StashComponent] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.component.RefappComponent] annotated as a component, but the type is not a concrete class.
NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.component.JiraComponent] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.component.FecruComponent] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.component.ConfluenceComponent] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.component.ClasspathComponent] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.component.BitbucketComponent] annotated as a component, but the type is not a concrete class. NOT adding to index file!!
[ERROR] Found a type [com.atlassian.plugin.spring.scanner.annotation.component.BambooComponent] annotated as a component, but the type is not a concrete class.
NOT adding to index file!!

My Environment is as follows:

Test>atlas-version

ATLAS Version: 8.0.16
ATLAS Home: C:\XXX\software\Atlassian\atlassian-plugin-sdk-8.0.16
ATLAS Scripts: C:\XXX\software\Atlassian\atlassian-plugin-sdk-8.0.16\bin
ATLAS Maven Home: C:\XXX\software\Atlassian\atlassian-plugin-sdk-8.0.16\apache-maven-3.5.4
AMPS Version: 8.0.2
--------
Executing: "C:\XXX\software\Atlassian\atlassian-plugin-sdk-8.0.16\apache-maven-3.5.4\bin\mvn.cmd" --version -gs C:\jzhang\software\Atlassian\atlassian-plugin-sdk-8.0.16\apache-maven-3.5.4/conf/settings.xml
Apache Maven 3.5.4 (1edded0938998edf8bf061f1ceb3cfdeccf443fe; 2018-06-18T02:33:14+08:00)
Maven home: C:\XXX\software\Atlassian\atlassian-plugin-sdk-8.0.16\apache-maven-3.5.4\bin\..
Java version: 1.8.0_171, vendor: Oracle Corporation, runtime: C:\Program Files\Java\jdk1.8.0_171\jre
Default locale: en_US, platform encoding: GBK
OS name: "windows 10", version: "10.0", arch: "amd64", family: "windows"

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