There’s something wrong with your SRT file or the video file, MCEBuddy it unable to add it:
2019-09-27T11:18:58 MCEBuddy.AppWrapper.MP4Box → Launching process C:\Program Files\MCEBuddy2x\mp4Box\mp4box.exe
2019-09-27T11:18:58 MCEBuddy.AppWrapper.MP4Box → Process arguments -add “C:\Program Files\MCEBuddy2x\working0\NFL Football - S2019E2037 - Los Angeles Chargers at Detroit Lions.srt”:hdlr=sbtl:lang=eng “C:\Program Files\MCEBuddy2x\working0\NFL Football - S2019E2037 - Los Angeles Chargers at Detroit Lions.m4v”
2019-09-27T11:18:58 MCEBuddy.AppWrapper.MP4Box → UI Session Admin Process : False
2019-09-27T11:18:58 MCEBuddy.AppWrapper.MP4Box → Setting process priority to Normal
→ Process exited with code -1073741515
If you can upload the original SRT, EDL and M4V file we can look into it.