I am using CorefAnnotator version 2.1.1 (latest) with OpenJDK version 21.0.2 on MacOS 14.4.1. Everytime I save my work as the ca2z file, I am unable to open it again and I get the error "org.xml.sax.SAXParseException: Premature end of file". I see that the size of my ca2z files are very small (in bytes), so maybe the issue is that the file is not getting saved.