com.galenframework.parser.SyntaxException: Unknown statement: header-logo:

[bpunati]

I am getting
com.galenframework.parser.SyntaxException: Unknown statement: header-logo:
in tutorial1/home.gspec:6
at com.galenframework.speclang2.pagespec.PostProcessor.processNode(PostProcessor.java:41)
at com.galenframework.speclang2.pagespec.PostProcessor.process(PostProcessor.java:33)
at com.galenframework.speclang2.pagespec.PageSpecReader.read(PageSpecReader.java:62)
at com.galenframework.speclang2.pagespec.PageSpecReader.read(PageSpecReader.java:45)
at com.galenframework.api.Galen.checkLayout(Galen.java:68)
at com.galenframework.api.Galen.checkLayout(Galen.java:59)
at com.galenframework.suite.actions.GalenPageActionCheck.execute(GalenPageActionCheck.java:52)
at com.galenframework.runner.GalenPageRunner.executeAction(GalenPageRunner.java:84)
at com.galenframework.runner.GalenPageRunner.run(GalenPageRunner.java:76)
at com.galenframework.runner.GalenBasicTestRunner.runTest(GalenBasicTestRunner.java:76)
at com.galenframework.tests.GalenBasicTest.execute(GalenBasicTest.java:55)
at com.galenframework.TestRunnable.runTest(TestRunnable.java:75)
at com.galenframework.TestRunnable.run(TestRunnable.java:101)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
at java.base/java.lang.Thread.run(Thread.java:832)

my home.gspec is
@objects
header-logo #header-logo
header-text #header h1

= Header =
header-logo:
left-of header-text 5px

can you please help on why i am getting this error?

Thanks in advance