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Good evening
I just found the problem by looking at the logs.
This is the heap size of java.
I upgraded it from 254MB to 512.
Since I failed to configure java, I went through a bat file for windows:
java -Xmx512m -jar C: \ Users \ drefp \ Downloads \ Ubooquity-2.1.2 \ Ubooquity.jar --libraryport 2202 --adminport 2203