模块不可用所需的Maven项目配置

我有一个运行Tomcat 8服务器的Java/Maven/JSP.项目结构如下,

我在pom.xml下面提供了这个文件,

    4.0.0

    com.puut.wallet
    1.0-SNAPSHOT
    war
    WalletApp
    simple-bitcoin-wallet

    
        org.bitcoinj
        bitcoinj-parent
        RELEASE
    

    
        
            
                src/main/resources
                true
            
            
                src/main/java
            
        
    

    
        
            org.bitcoinj
            bitcoinj-core
            ${project.parent.version}
        
        
            com.google.guava
            guava
            18.0
        
        
            org.slf4j
            slf4j-log4j12
            1.7.20
        
        
            net.glxn
            qrgen
            1.3
        
        
            javax.servlet
            javax.servlet-api
            3.1.0
            provided
        
    

当我运行该项目时,我收到以下错误,

Error:Maven Resources Compiler: Maven project configuration required for module 'WalletApp' isn't available. Compilation of Maven projects is supported only if external build is started from an IDE.

我采取了几项措施,

a. in the terminal, run `mvn clean`
b. project -> right click -> `Make Module WalletApp`
c. project -> right click -> `Recompile Module WalletApp`
d. File -> Invalide Caches/Restart .... [This restarts the project]
e. Synchronize 

显然,他们都没有解决这个问题.顺便说一句,我InteliIJ用于该项目.我该怎么做才能解决这个问题？

在Event Log,我得到一个选项Add as maven project.我选择了该选项,问题立即得到解决.