Running multiple projects in SoapUI using testRunner

I have created a REST and multiple SOAP projects in SoapUI. I want to execute the Rest project first and then Soap projects one by one using TestRunner. Is it possible in SoapUI free version?

I tried it by creating a new utility project in SoapUI with the groovy script that will call the Rest Project first and later the Soap Project. But it is not working as expected.

TestRunner fails with error " java.lang.NullPointerException: Cannot invoke method getProjectByName() on null object"

While running through SoapUI GUI, the groovy script in the utility project completed the execution in success, but other projects were executed in parallel