when i try to export my recording in H.264 it pops up with an error. how do i fix?

I just looked up this issue because I had it just now. I wondered how this could be if I had already just exported several clips up until now. However, for me, it was one little bit of audio that I accidentally put on the track that didn't have any corresponding video or picture above it in the video track to go with it. You can't put audio without any video or still images corresponding to it on the timeline. My export worked after I realized there was a little bit of extra audio on my production, so then I deleted it and tried again.

Please tell us what program you are using so that this may be moved to the proper forum for technical help.  This is the nontechnical Lounge Forum.