Problems rendering

I am trying to render what I have done to png images. The problem is that I get black images all the time.

I have been checking and the lights are on for rendering, so is the camera. Moreover if I set up the viewport shading to render I can see what I want (from camera view). However when I press the render button I get again a black image. This is my blander file:calibration_laser.blend (968 KB)



Disable Sequencer in render panel or delete strip in VSE.

Thank you, I disabled the sequencer and now it works fine!