I get "Can't use Plug-In in "Export Time Lapse (LRTimelapse)." "The plug-in had an internal error while opening the Export dialog".
Latest version of LR Timelapse
Latest version of Lightroom (today's update).
Works here without issues. Maybe it would help to restart your computer and Lightroom. Then see if it works.
If not, check the Lightroom Plugin Manager, see if it provides any additional information.
Also reinstalling the latest version of LRTimelapse (with Lightroom closed!) might help.
Solved! I did what you suggested and after re-install it gave me the same message. Then from the Lightroom Plugin Manager I pressed the "Re-load Plugin" button and all is well. Thank you for your most excellent software.