from lightroom 5 Im exporting. it show export bar progressing and when it gets to the end.
unable to export
an internal error has occured LRTexport task. lua 284: attempt to index local 'FH'
{a nil value}
Mac OS X 10.9.1
LRTimelapse 3.2.1

The plugin seem not to be able to write to the interface file to communicate with LRTimelapse.
The rendered sequence however should be there - you can just launch the final rendering manually from LRTimelapse via File/Render. Then select the just exported LRT_* sequence.

I'm not sure why the plugins is not able to write to the interface file.
The location is <your documents>/LRTimelapse/LRTInterface.txt
please make sure that the path <your documents>/LRTimelapse exists and is writable.

Same problem on two of my Mac's here.

LRTExportTask.lua:145: attempt to perform arithmetic on a string value

Everything else works but error on export

First is running ok "preparation"

Second step in lightroom gives the error

Hi Edward,
I just fixed the error message.
It should say "Could not create destination directory".
Please check that the output path you configured in the LRTExport dialog is available. If necessary, please create it.
Create it somewhere, where Lightroom has write access (data partition or whatever).
Let me know!
Best
Gunther