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This article describes how to correct an issue adding a Node when NTA is installed. If you check the BusinessLayerHost.log file you will find the error:
Unable to find assembly 'SolarWinds.DPI.BusinessLayer'
NTA 4.1.2 and earlier
This is caused by installing only 64-bit C++ 2013 runtime (part of NTA installation). If there is an older build of 32-bit C++ 2013 runtime, it was uninstalled for unknown reason.