Cannot get property 'MSBuildProjectName' on null object when building a project file with assemblyInfoPatcher task

[gdurand]

I have this error when the build is configuring. If I specify a solution file it works fine and if I specifify a project file and remove the task assemblyInfoPatcher it works fine.
The solution contains several projects.
The project and solution are attached: project_and_solution.zip

msbuild {
    //dependsOn << assemblyInfoPatcher
    //solutionFile = 'src/main/cs/' + project.name + '.sln'
    //projectName = project.name
    projectFile = 'src/main/cs/' + project.name + '.csproj'
    targets = ['Clean', 'Rebuild']
    configuration = 'Release'
    platform = 'Any CPU'
    destinationDir = "$buildDir/bin"
    intermediateDir = "$buildDir/msbuild/obj"
    generateDoc = true
    verbosity = 'quiet'
}

assemblyInfoPatcher {
    version = project.version - '-SNAPSHOT'
    fileVersion = project.version
}

The error (triggered by com.ullink.AssemblyInfoVersionPatcher$_closure5.doCall) :

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring root project 'Omega.Core'.
> Cannot get property 'MSBuildProjectName' on null object

* Try:
Run with --info or --debug option to get more log output.

* Exception is:
org.gradle.api.ProjectConfigurationException: A problem occurred configuring root project 'Omega.Core'.
        at org.gradle.configuration.project.LifecycleProjectEvaluator.addConfigurationFailure(LifecycleProjectEvaluator.java:79)
        at org.gradle.configuration.project.LifecycleProjectEvaluator.notifyAfterEvaluate(LifecycleProjectEvaluator.java:74)
        at org.gradle.configuration.project.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:61)
        at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:532)
        at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:93)
        at org.gradle.execution.TaskPathProjectEvaluator.configureHierarchy(TaskPathProjectEvaluator.java:42)
        at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:35)
        at org.gradle.initialization.DefaultGradleLauncher$2.run(DefaultGradleLauncher.java:125)
        at org.gradle.internal.Factories$1.create(Factories.java:22)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:52)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:122)
        at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32)
        at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:99)
        at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:93)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:90)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62)
        at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:93)
        at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:82)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:94)
        at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)
        at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:43)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:28)
        at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:75)
        at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:45)
        at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:51)
        at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:28)
        at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:43)
        at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:170)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:237)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:210)
        at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)
        at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:206)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
        at org.gradle.launcher.Main.doAction(Main.java:33)
        at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:54)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)
        at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
        at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:30)
        at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
        at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
Caused by: java.lang.NullPointerException: Cannot get property 'MSBuildProjectName' on null object
        at com.ullink.ProjectFileParser.getProjectName(ProjectFileParser.groovy:22)
        at com.ullink.Msbuild.resolveProject(Msbuild.groovy:137)
        at com.ullink.Msbuild.getProjects(Msbuild.groovy:69)
        at com.ullink.Msbuild_Decorated.getProjects(Unknown Source)
        at org.gradle.api.internal.BeanDynamicObject$MetaClassAdapter.getProperty(BeanDynamicObject.java:166)
        at org.gradle.api.internal.BeanDynamicObject.getProperty(BeanDynamicObject.java:109)
        at org.gradle.api.internal.CompositeDynamicObject.getProperty(CompositeDynamicObject.java:81)
        at com.ullink.Msbuild_Decorated.getProperty(Unknown Source)
        at com.ullink.AssemblyInfoVersionPatcher$_closure5_closure10.doCall(AssemblyInfoVersionPatcher.groovy:30)
        at org.gradle.api.internal.ClosureBackedAction.execute(ClosureBackedAction.java:67)
        at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:130)
        at org.gradle.util.ConfigureUtil.configure(ConfigureUtil.java:110)
        at org.gradle.api.internal.AbstractTask.configure(AbstractTask.java:488)
        at org.gradle.api.internal.AbstractTask.configure(AbstractTask.java:58)
        at org.gradle.api.internal.ClosureBackedAction.execute(ClosureBackedAction.java:59)
        at org.gradle.internal.Actions$FilteredAction.execute(Actions.java:202)
        at org.gradle.api.internal.DefaultDomainObjectCollection.all(DefaultDomainObjectCollection.java:110)
        at org.gradle.api.internal.DefaultDomainObjectCollection.all(DefaultDomainObjectCollection.java:115)
        at org.gradle.api.internal.tasks.RealizableTaskCollection.all(RealizableTaskCollection.java:187)
        at org.gradle.api.internal.DefaultDomainObjectCollection.withType(DefaultDomainObjectCollection.java:126)
        at org.gradle.api.DomainObjectCollection$withType.call(Unknown Source)
        at com.ullink.AssemblyInfoVersionPatcher$_closure5.doCall(AssemblyInfoVersionPatcher.groovy:29)
        at org.gradle.listener.ClosureBackedMethodInvocationDispatch.dispatch(ClosureBackedMethodInvocationDispatch.java:40)
        at org.gradle.listener.ClosureBackedMethodInvocationDispatch.dispatch(ClosureBackedMethodInvocationDispatch.java:25)
        at org.gradle.internal.event.AbstractBroadcastDispatch.dispatch(AbstractBroadcastDispatch.java:44)
        at org.gradle.internal.event.BroadcastDispatch.dispatch(BroadcastDispatch.java:79)
        at org.gradle.internal.event.BroadcastDispatch.dispatch(BroadcastDispatch.java:30)
        at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
        at com.sun.proxy.$Proxy13.afterEvaluate(Unknown Source)
        at org.gradle.configuration.project.LifecycleProjectEvaluator.notifyAfterEvaluate(LifecycleProjectEvaluator.java:67)

[gluck]

Hi, it's usually a bad idea to build a csproj outside of a solution context (e.g. nuget restores packages relative to solution directory, and solution configuration can alter configuration/platform for referenced projects), may I ask why you need to do it ?

That being said it'd be nice for this plugin not to crash in that scenario :)

[gdurand]

In my solution, in Debug config, all the dependencies of my main project are built. For release I want only the main project to be built. I can achieve this by specifying only the main project in the Release config or create a "Debug Main" config, but I saw the option to build only 1 project in your plugin so I tried to use it. I can still work with the Release config and the solution. I just wanted to report a bug that is not so easy to figure out when first using the plugin.
BTW I'm new to gradle and the integration of Visual Studio into an automated build system. I come from maven/java and things are quite not the same, to say the least.

[gluck]

This is actually fixed by #58 already, will be in vNext