Looks like you followed the wrong steps. Your trying to run message server directly and clicking on the wrong file. You also ran it on the wrong port, 8080
Please run the MessageServerTool x64 version and install it to port 9000+ as the guide says here.
2.2.2. What is SambaPOS Messaging Server? How to Install? – SambaPOS Knowledgebase
This guide will help you as well:
8.10. SambaPOS Mobile Client MC3 Setup – SambaPOS Knowledgebase