External axis problem

mahukannath

hi all, I have created an external axis in Robot Studio 2008 using 3d modelling option. It has one linear and two rotational axises. whenever im trying to connect this to a virtual controller im getting a message like "cant use two different axises simeltaneously" or "library cannot found". Do I need a seperate library for multiple axis? from where i can get it? moreover can i use external multiple axises for programming perfectly?