Final Cut Pro 10.3.4 on Mac OS Sierra 10.12.6 is Unexpectedly Quitting

Final Cut Pro 10.3.4 on Mac OS Sierra 10.12.6 is Unexpectedly Quitting when I try to make a Master File

My setup has ran fine for a few years. I know it's older. 

I recently had an assignment with 42, 16GB SD Cards (all full). I put all of that (nearly 4TB) on an external hard drive and transcoded them into FCP. When I go to create a Master File the program quits.

As a test, I've even tried to render old projects that were rendering fine before but now also crash the program.

I have reset the application preferences with no fix.

Also, I have tried to create a simple project with just a single image screen capture. When I go to create a Master File that also makes the program quit. So size doesn't seem to be the issue.

I have crash logs if that would help. They exceed this posts capability.

Any ideas?

I appreciate your help.

Thank You,

Dwayne