Getting error on Cotroller as Citrix client was not found

Hello Guys,

 I am new to Citrix Protocol. When I tried to run the test on Th controller of Citrix application, I am getting the below error.

Error: Citrix client was not found.[MsgId: MERR-91971].

1.Do all the LG's must has Citrix Client installed?

2.What else components should have LG's and Contoller machine & Vugen Machine  alone?

Please advise me!

Thanks,

Rajani