RobotC error

Problem: Warning:Mismatched typedefs. Converting typedef ‘char’ to typedef ‘TVexJoysticks’, value ‘Ch2’

#pragma config(Motor,  port6,           LiftLeft,      tmotorVex269_MC29, openLoop)
#pragma config(Motor,  port7,           LiftRight,     tmotorVex269_MC29, openLoop, reversed)
//*!!Code automatically generated by 'ROBOTC' configuration wizard               !!*//

task main()
{
	while(true){
		if(Btn6D!=1){
			motor[LiftLeft] = -95;
			motor[LiftRight] = -95;
		}
		if(Btn6U!=1){
				motor[LiftLeft] = 95;
				motor[LiftRight] = 95;
		}
	}
}
	

You need to use vexRT Btn6D ] to get button status rather than just Btn6D.