Hi everybody, im glad with all your help and it was really usefull! In particular i wanna thank Regular Polygon, because they were impeccable in solving this issue.
My ignorance in computers maybe have generated this feeling that the bug was in the KeyFrame Animation Plugin, but now i realize that not.
Anyway, last night i was desperate and restless,so i started to retry what Regular Polygon told me , to save the file in a flash drive. I tried in other two i have and then, the third one worked out, with this file name: 2.tweens
I still dont understand how to fix it, however, my principal issue is now solved, the tweens creation is working out and that quite easy! Im gonna take care of this particular flash drive.
Now im looking for the better way to render this images to create a photosequence, and then use FinalCut or something like this to edit the video. I hope that its not impossible.
Although i´m not certain, i´m studing Kerkythea to do this, but still with no tangible results.
Once again i thank everybody for the help, and for now ScketchUcation and KeyFrame Animation will be part of my daily basis.
My best Regards.
Pedro