Delete Project Level Properties With Specific Name After Execution

Hi,

Bit embaressed I can't fix this myself :(

I have some project level properties I create after running a setup testsuite to grab some GUIDS out of the database for later use in the project and I'd like to delete these project level properties after each execution run. 

I have a number of project level properties and I only want to delete ones containing a certain string in the property name, so I was thinking add a script to the project teardown.

I almost found exactly what I needed via this link

In the linked page HimanshuTayal 's code reads as follows (which gets added to the testCase teardown script):

def targetTestCase = testRunner.testCase;
def propList = targetTestCase.getPropertyNames()
propList.each{
	if(it.contains("ScheduleID")){
		targetTestCase.removeProperty(it);
	}
	else{
		//Do nothing
	}
}

HOWEVER - the above is to delete testcase level properties rather than project level properties - so I altered it to the following (added it to the Project teardown script) thinking this would work

def targetTestCase = testRunner.testCase.testSuite.project;
def propList = targetTestCase.getPropertyNames()
propList.each{
	if(it.contains("ScheduleID")){
		targetTestCase.removeProperty(it);
	}
	else{
		//Do nothing
	}
}

But I got the following error response

Tue Jun 18 10:57:20 BST 2019: ERROR: com.eviware.soapui.support.scripting.ScriptException: Error in TearDown Script of Eehatevs

Can anyone see what I'm doing wrong? well - I'm sure everyone can see what I'm doing wrong - but  I cant. :)

I checked around and to navigate to the project level - (in the testRunner line) and that appears how to drill to the project level? (e.g. testRunner.testCase.testSuite.project)??

Cheers!

richie