PanelView C600

Hi guys, I'm doing a little practice with a Micrologix 1400 and a HMI PanelView C600. The program is so simple. Turn on the output O 0:0 through the input B3 0:0 (START) and turn it off with B3 0:1 (STOP). I'm trying to link these inputs to the button Start and Stop created in the HMI. When I validate the communication I don't get any errors but when I try to validate the tags I get this error: 

Tag StartPb with address START has either an unknown address, unacceptable data or undefined controller name. 

Tag StopPb with address STOP has either an unknown address, unacceptable data or undefined controller name.

Thanks in advance