Why won't Premiere Rush produce the MP4 file?

Hi! I'm having problems with exporting a project that I have edited in Premiere Rush. I have exported the project successfully before. But when I try to export it now, the program produces other files (see the screenshot below), but not the MP4. (Also: When the rendering seems to be complete (since the process has counted down to 0), there is no blue "Finish"-button.) Any ideas on what may cause this?