KDEnlive and output file

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http://ubuntuforums.org – Hi I new Ubuntu and Linux user and I try to get Kdenlive video editing software to work... I install it, can edit videos and save project but when I rendering, out put file is finish in second and file size 0kt? Why is doing that? I don't understand... Clip what I editing is 1 min lenght... Can somebody help me... Google don't help me because I don't know what I have to search... I testing more and rendering works fine if I don't add text clip to it. If text clip added then rendering result is 0kt video file... (Hardware)