Laser Scanner Merging in one Topic

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Hello,

I am working on the package for merging multiple laser scanner data in one topic (Ira Laser Tools). I am getting 2 data from different sensors placed one on the front of the robot and one on the rare (scan1 and scan2), Then i apply the multi merger node to merge to get one laser scan data (scan), but it is always empty and giving me the following warning

[ WARN] [1467292029.145711135]: Transformer::setExtrapolationLimit is deprecated and does not do anything

I created in my URDF model a virtual laser which is my destination frame_id (in green in the picture), it is placed at the midpoint of the rare and front lasers.

Note that in the picture the data in red are the data received from scan1 and scan2 respectively.

Please find in the attached file above a screen shoot that describes the situation. And please note than the scan topic is empty.

Is there any way to solve this problem please? i would be really thankful.