This happens when you do not have xml2 library installed to your linux distribution. Could you please check if your /usr/lib directory contains libxml2.so.1 files or so ?
Usually, it is advised by OMNeT++ to be installed to the system. There is, however, one other altnernative to xml2 and it is expat. You may either try installing xml2, rebuild omnet++ and nesct or use expat instead. To try, edit your config file and replace -lxml2 with -lexpat. If this does not work, i suggest you to install xml2 library to your system, rebuild omnet++ and nesct.
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