2 errors when building starter project in visual studio 2017

hey im trying to set up spatialos for ue4 , im following their guide , and i reached the “Building” part , the 3rd step , when i tried to build the starter project i got two errors :
1- Could not find definition for module ‘SpatialGDK’ (referenced via Target → StarterProject.Build.cs)
2-The command exited with code -1.
how can i get rid of them for a successful build ?

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