WConstant error using NewSoftSerial Library

Hello,

I'm experiencing a Wconstant error - not being found using a New Soft Serial library. I do not know how to get past this. I'm using a Arduino Zero trying to do serial communications. Can someone help me?

I'm using a Arduino Zero trying to do serial communications.

By using an obsolete library? Why?

https://arduino-info.wikispaces.com/SoftwareSerialRS485Example

stubblet: https://arduino-info.wikispaces.com/SoftwareSerialRS485Example

Am I supposed to guess the relevance of this link to your issue? The code on that page does NOT use NewSoftSerial, so why are you?