Message is: Error. Check LRT export log in yr doc folders. I think the prob lies in the file name in LR. Says, MIXED I can change it but dont know what to write in the box that comes up for poss: file name. The box: FILE NAMING: suggests-custom name,Filename Seq: Edit, ....etc. ....also ...start number. This box is on right side of LR. File name.Dont understand. thnks

Sorry, I don't understand your post. Would it be possible to write complete sentences and maybe add a screenshot?
LRTExport will normally take care of the file naming for you no need to do anything. If you get an error to please check the log, it would be helpful, if you could add the log output here, in order for me to see what's going on. The Log file is in your documents folder, it's called LRTExport.log.