Error on importXML

I exported XML as system view in modeshape 2.8.3. Then I tried to import it in modeshape 3.7.2 and got an error. I'm using the same nodetypes for both modeshape versions.
Horia Chiorean suggested a workaround: "manually change the XML file and for each <sv:property sv:name="jcr:isCheckedOut" sv:type="Boolean"> property set its value to "true" (instead of false)" and it worked.