Loading of file.xml failed. Cannot read the array length because "this.patternIndex" is null.

[mrmancuso]

I get the following error message whenever I create an .xml file in BEAUti and then I try to open it up again for further editing: Loading of file.xml failed: Cannot read the array length because "this.patternIndex" is null. Cannot invoke "org.w3c.dom.Node.getNodeValue()" because the return value of "org.w3c.m.NamedNodeMap.getNamedItem(String)" is null". This only happens when the .xml was created with a partitioned NEXUS file with multiple genes. BEASTLabs is installed and updated on my 2024 MacBook Pro. Could you help me out? Thank you in advance.