It seems that your DragAndDrop library is not up to date.
It looks strange to me that your core library is 10.31, mine is 10.20.
I downloaded the latest B4J version again and above is what I get.
b4xlibs do not require an XML file. The IDE parses the packed code modules. With this tool you can generate the XML from the packed source code. It is useful for documentation purposes as there are tools that expect this XML. For example...
It seems that your DragAndDrop library is not up to date.
It looks strange to me that your core library is 10.31, mine is 10.20.
I downloaded the latest B4J version again and above is what I get.