Local valid certificate not found - pbiviz package not working

Tryingto create custom visual. Can someple please tell me what the following errror means and how to correct it?

node.exe : warn Local valid certificate not found.
At C:\Users\...\npm\pbiviz.ps1:24 char:5
+ & "node$exe" "$basedir/node_modules/powerbi-visuals-tools/bin/pb ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: ( warn Local v...cate not found.:String) [], RemoteException
+ FullyQualifiedErrorId : NativeCommandError