我加了一句 travis-ci 我的github项目。项目本身是多模块的，包括 :client , :server 以及 :shared . 在gradle的构建中 :client 我组织的模块 sourceSets 具体如下：

sourceSets {
    main {
        java {
            runtimeClasspath += project(":shared").sourceSets.main.java.srcDirs
            srcDirs += project(":shared").sourceSets.main.java.srcDirs
        }
    }
}

现在，什么时候 travis-ci 跑 gradle check 故障如下：

$ gradle server:clean server:check
FAILURE: Build failed with an exception.

* Where:

Build file '/home/travis/build/bduisenov/mockserver/client/build.gradle' line: 55

* What went wrong:

A problem occurred evaluating project ':client'.
> Could not find method main() for arguments [build_ab0sue8nexlysud7wfupu5ddr$_run_closure4_closure12@3fb9a67f] on project ':client'.

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
Total time: 10.05 secs
The command "gradle server:clean server:check" exited with 1.

虽然在本地运行，但我对此没有异议。
有什么想法吗？