If you get this error when trying to run GBTimelapse, it is most likely a corrupt options file.
To fix the problem,
1) Using Windows file explorer, go to the folder "C:\ProgramData\GBTimelapseEOS"
2) Find the file "GBTimelapseEOS_Options.xml" and delete it.
3) Try running GBTimelapse again.
4) You will need to re-enter all your previous option settings