Ready API1.5 - Null pointer when importing a Soap UI project

I am getting a Null pointer exception while importing a project I use in Soap UI. This is stopping my migration to Ready API.

Stacktrace:

java.lang.NullPointerException
at com.eviware.soapui.impl.wsdl.WsdlProjectPro.a(WsdlProjectPro.java:1159)
at com.eviware.soapui.impl.wsdl.WsdlProjectPro.setActiveEnvironment(WsdlProjectPro.java:1145)
at com.eviware.soapui.impl.wsdl.WsdlProjectPro.setActiveEnvironment(WsdlProjectPro.java:1186)
at com.eviware.soapui.impl.wsdl.WsdlProjectPro.loadProject(WsdlProjectPro.java:426)
at com.eviware.soapui.impl.wsdl.WsdlProject.<init>(WsdlProject.java:248)
at com.eviware.soapui.impl.wsdl.WsdlProject.<init>(WsdlProject.java:228)
at com.eviware.soapui.impl.wsdl.WsdlProjectPro.<init>(WsdlProjectPro.java:188)
at com.eviware.soapui.impl.wsdl.WsdlProjectProFactory.createNew(WsdlProjectProFactory.java:106)
at com.eviware.soapui.impl.wsdl.WsdlProjectProFactory.createNew(WsdlProjectProFactory.java:1)
at com.eviware.soapui.impl.WorkspaceImpl.importProject(WorkspaceImpl.java:386)
at com.eviware.soapui.impl.actions.ProImportWsdlProjectAction.perform(ProImportWsdlProjectAction.java:44)
at com.eviware.soapui.impl.actions.ImportWsdlProjectAction.perform(ImportWsdlProjectAction.java:1)
at com.eviware.soapui.support.action.swing.SwingActionDelegate.actionPerformed(SwingActionDelegate.java:129)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)