Only first slide is rendered I do have my animation done. But I don`t know what I pressed and now when I press Animation, only the first slide(frame) is showed in the rendered window but there is no files on the output folder. No JPG or AVI or MPEG. Any suggestion?
Thanks in advance!!
Here is the screenshot

The image in the left side is the result of the render after clicking over the animation button. Blender rendered the first frame and then stop.
@DiegoAdum the problem is in the composting , you are combining a layer from blender_internal and a layer from Cycles ,you'll have to render the Volumetric scene first , or remove the composting and render both than pass the images through the processing.

Thanks @Chebhou!! Following your suggestion I change the scene and press Animation button. the render start but only for the 2 scene. I change back the scene to the first one and hit Animation button and now is working again! It seems something was blocked!!! Thanks a lot!!!