how fix class ModBusSlave

Please help fix this error

In file included from ModBusSlave.ino:5:0:
C:\Users\hq01\Desktop\arduino-1.6.0-windows\arduino-1.6.0\libraries\ModBusSlave/Modbus_Slave.h:19:7: error: redefinition of ‘class ModBusSlave’
class ModBusSlave


why windows was unable to install your cp2102 usb to uart bridge controller?

Thank you to help me
The problem I tried to raise this code on the Arduino Uno in this link below blogger

Where I have Arduino Uno and connected directly with the computer, where do I program linking them with mach3

Is there a solution or a way to overcome this problem