Steps to fix failing build builds:
1. Reset all settings
Use the red reset icon
Disable lineup rules
Reset build settings
2. Recognize how much time you have left
If you have <15min before lock, just edit your lineups in the build that worked
3. If you have time, troubleshoot by adding customization back in one at a time
Remove all requested exposures, groups / stacks, and custom build settings
Add back customization one at a time in order of most important to least important
Test build between each change