Laptop Rush Premier wont render

Several times I have worked for hours on a project to find that it will not render. The error message is:

Error compilng movie

Error completing render

Writing with exporter:H264

Writing file type :H264

Around timecode: 00.00.00.08

Component: H264 of type Exporter

Selector:9

Error code: 2147287036

This particular movie build allso had a failure in the titles. You could put one in but not title field for editiong never appeared. That is, the title would be black, not allowing you to add text although the word TITLE was visible - only on the timeline. Can anyone help with this? its a time sensative project. I'll try to recreatit on the mobile device and desktop, but there is no sync on this and other projects. No idea why. Thanks, Mark