Add type info to ofJson error msg
Add type info to ofJson error msg

ncave/Fable,fable-compiler/Fable,ncave/Fable,ncave/Fable,ncave/Fable,fable-compiler/Fable,fable-compiler/Fable,ncave/Fable,inosik/Fable,ncave/Fable,fable-compiler/Fable,inosik/Fable,ncave/Fable,fable-compiler/Fable,fable-compiler/Fable,fable-compiler/Fable