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The problem seems to be that you tried to install a mashup with embedded components (widgets or operators). One of those components has a config.xml file that cannot be parsed by WireCloud. We have removed support for the old https://wirecloud.conwet.fi.upm.es/ns/template# description format, so probably that component is using it for its config.xml file.

We are working on fixing the internal server error (WireCloud should provide a better message in those cases). But the mashup containing the component should be fixed by upgrading the problematic component (See this StackOverflow thread for more info). The error report doesn't contain the contents of the requests, so please, let's us know if you were installing an offering from the FIWARE Lab Store/Marketplace, if you downloaded the mashup from the documentation, ... or any information you think useful so we are able to fix it :-)