public void setModuleVersion(@Nullable ModuleVersionIdentifier moduleVersion) {
        this.moduleVersion = moduleVersion;
    }

    /**
     * Returns a single jar or class folder
     */
    public File getLibraryFile() {
        return ((FilePath) this.getClasses().iterator().next()).getFile();
    }

    /**
     * Returns a single javadoc jar or javadoc folder
     */
    public File getJavadocFile() {

        if (dep instanceof ModuleDependency) {
            return ((ModuleDependency) dep).getName();
        } else if (dep instanceof SingleEntryModuleLibrary) {
            return ((SingleEntryModuleLibrary) dep).getLibraryFile();
        }  else if (dep instanceof ModuleLibrary) {
            return ((ModuleLibrary)dep).getClasses();
        } else {
            throw new IllegalArgumentException("Unsupported type: " + dep.getClass().getName());

        DefaultIdeaSingleEntryLibraryDependency defaultDependency = new DefaultIdeaSingleEntryLibraryDependency()
            .setFile(d.getLibraryFile())
            .setSource(d.getSourceFile())
            .setJavadoc(d.getJavadocFile())
            .setScope(new DefaultIdeaDependencyScope(d.getScope()))
            .setExported(d.isExported());

Method <org.gradle.plugins.ide.idea.model.SingleEntryModuleLibrary.getLibraryFile()> does not have raw return type assignable to org.gradle.api.provider.Provider in (SingleEntryModuleLibrary.java:0)