Need help in mirroring the HDMI input

I would like to mirror the video, HDMI input into my television and monitor both. I have purchased an HDMI splitter and I am able to split the HDMI input into two devices, but it looks like there is some problem with the DVI adapter in my monitor. Because in one monitor, it is showing error message "no DVI connected" and in the other one it is trying to display something but just flashing. When I connect HDMI directly to my monitor without splitting it works fine but not with splitter. Why is the splitter causing this kind of issue?
