I also get this error. If I try to run from VisualStudio I get a popup called Find Source that is looking for substancecoremodule.cpp
It is looking in this directory: d:\buildfarm\buildmachine_++portal+main\rocketsync\hostproject\plugins\substance\source\substancecore\private\substancecoremodule.cpp
After pointer to the right location, it crashes on line 90 of it UE_LOG(LogSubstanceCoreModule, Fatal, TEXT(“Unable to load Substance Library.”));