If you get strange ExifTool errors in the log file, exiftool might not have been installed/compiled correctly the first time it was called.
To fix this on windows:

Close LRTimelapse.
Open a command line (terminal):
- Press Windows Key + R
- Type
CMD.exe
- Hit Enter.

Now you should see a black terminal window.
Copy paste the following 2 lines one by one, hit Enter after each line:

for /D %d in (%TEMP%\par-*) do rmdir /s /q %d

"C:\Program Files\LRTimelapse 6"\exiftool.exe -ver

After the second command you should see the ExifTool Version number displayed.

Now reopen LRTimelapse and try again.