I created a module project using servicebuild template (gradebook-api, gradebook-service),  but suddenly after add an export package in api below

Bundle-Name: gradebook-api
Bundle-SymbolicName: com.liferay.training.gradebook.api
Bundle-Version: 1.0.0
Export-Package: \
	com.liferay.training.gradebook.exception,\
	com.liferay.training.gradebook.model,\
	com.liferay.training.gradebook.service,\
	com.liferay.training.gradebook.service.persistence,\
	com.liferay.training.gradebook.validator
-check: EXPORTS
-includeresource: META-INF/service.xml=../gradebook-service/service.xml

 i have a problem in the BuildService gradle task that's says :

Some problems were found with the configuration of task ':modules:gradebook:gradebook-api:buildService' (type 'BuildServiceTask').
> File 'C:\Liferay\ide-workspace\training-workspace\modules\gradebook\gradebook-api\service.xml' specified for property 'inputFile' does not exist.
> No value has been specified for property 'apiDir'.

And this is a how I add the api module as dependency in service.

dependencies {

	compileOnly group: "com.liferay", name: "com.liferay.petra.io"
	compileOnly group: "com.liferay", name: "com.liferay.petra.lang"
	compileOnly group: "com.liferay", name: "com.liferay.petra.string"
	compileOnly group: "com.liferay", name: "com.liferay.portal.aop.api"
	compileOnly group: "com.liferay.portal", name: "com.liferay.portal.kernel"
	compileOnly group: "org.osgi", name: "org.osgi.annotation.versioning"
	compileOnly group: "org.osgi", name: "org.osgi.core"
	compileOnly group: "org.osgi", name: "org.osgi.service.component.annotations"
	compileOnly group: "javax.portlet", name: "portlet-api"
	compileOnly group: "javax.servlet", name: "javax.servlet-api"
	compile project(":modules:gradebook:gradebook-api")

}

buildService {
	apiDir = "../gradebook-api/src/main/java"
}

group = "com.liferay.training.gradebook"

Thanks.