Fatal Error-compile new material for Soil-Pipe Interaction

[KyriakosTryphonos]

Hello OpenSees Community,

I am trying to compile a new material in OpenSees. My goal is to modify the parameters of an existing uniaxial material PySimple1 which is suitable for soil-pipe interaction. I want to modify some of the parameters of the existing material, so they will match the experimental and analytical results extracted from soil-pipe interaction.

First, I tried to be familiarized with the compilation procedure, so I tried to compile the existing example ElasticPPcpp material. I followed all the steps in y Dr. Frank Mckenna's tutorial. Unfortunately, I am getting a fatal error when I am trying to compile that material. The message I am getting is the following:

1>LINK : fatal error LNK1561: entry point must be defined
1>Done building project "ElasticPPcpp.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Is there anyone can help me with this type of error?

The version of VS I am using is VS2017 and my OS is 64 bit.

Regards,
Kyriakos